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820642613 = 7117234659
BaseRepresentation
bin110000111010100…
…000001100110101
32010012011222000212
4300322200030311
53140041030423
6213233115205
726223230030
oct6072401465
92105158025
10820642613
1139125aa3a
121aa9b8b05
1310102c95b
147adc0017
154c0a3578
hex30ea0335

820642613 has 4 divisors (see below), whose sum is σ = 937877280. Its totient is φ = 703407948.

The previous prime is 820642591. The next prime is 820642727. The reversal of 820642613 is 316246028.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 820642613 - 212 = 820638517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 820642613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820645613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58617323 + ... + 58617336.

It is an arithmetic number, because the mean of its divisors is an integer number (234469320).

Almost surely, 2820642613 is an apocalyptic number.

It is an amenable number.

820642613 is a deficient number, since it is larger than the sum of its proper divisors (117234667).

820642613 is a wasteful number, since it uses less digits than its factorization.

820642613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117234666.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 820642613 is about 28646.8604387985. The cubic root of 820642613 is about 936.2346023114.

The spelling of 820642613 in words is "eight hundred twenty million, six hundred forty-two thousand, six hundred thirteen".

Divisors: 1 7 117234659 820642613