82748782621 has 8 divisors (see below), whose sum is σ = 83088747000. Its totient is φ = 82409406720.

The previous prime is 82748782607. The next prime is 82748782661. The reversal of 82748782621 is 12628784728.

It can be written as a sum of positive squares in 4 ways, for example, as 64790102521 + 17958680100 = 254539^2 + 134010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82748782621 - 2²⁹ = 82211911709 is a prime.

It is a super-2 number, since 2×82748782621² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82748782661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135801 + ... + 428881.

It is an arithmetic number, because the mean of its divisors is an integer number (10386093375).

Almost surely, 2^82748782621 is an apocalyptic number.

It is an amenable number.

82748782621 is a deficient number, since it is larger than the sum of its proper divisors (339964379).

82748782621 is a wasteful number, since it uses less digits than its factorization.

82748782621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294239.

The product of its digits is 4816896, while the sum is 55.

The spelling of 82748782621 in words is "eighty-two billion, seven hundred forty-eight million, seven hundred eighty-two thousand, six hundred twenty-one".