827720641 has 4 divisors (see below), whose sum is σ = 902967984. Its totient is φ = 752473300.

The previous prime is 827720629. The next prime is 827720653. The reversal of 827720641 is 146027728.

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 an interprime number because it is at equal distance from previous prime (827720629) and next prime (827720653).

It is a cyclic number.

It is not a de Polignac number, because 827720641 - 2⁵ = 827720609 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 827720641.

It is not an unprimeable number, because it can be changed into a prime (827721641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37623655 + ... + 37623676.

It is an arithmetic number, because the mean of its divisors is an integer number (225741996).

Almost surely, 2^827720641 is an apocalyptic number.

It is an amenable number.

827720641 is a deficient number, since it is larger than the sum of its proper divisors (75247343).

827720641 is a wasteful number, since it uses less digits than its factorization.

827720641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75247342.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 827720641 is about 28770.1345321846. The cubic root of 827720641 is about 938.9185696009.

The spelling of 827720641 in words is "eight hundred twenty-seven million, seven hundred twenty thousand, six hundred forty-one".