827990645 has 16 divisors (see below), whose sum is σ = 1065623040. Its totient is φ = 615685824.

The previous prime is 827990641. The next prime is 827990659. The reversal of 827990645 is 546099728.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 827990645 - 2² = 827990641 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 827990593 and 827990602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827990641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77189 + ... + 87258.

It is an arithmetic number, because the mean of its divisors is an integer number (66601440).

Almost surely, 2^827990645 is an apocalyptic number.

It is an amenable number.

827990645 is a deficient number, since it is larger than the sum of its proper divisors (237632395).

827990645 is a wasteful number, since it uses less digits than its factorization.

827990645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164524.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 827990645 is about 28774.8265850552. The cubic root of 827990645 is about 939.0206508252.

The spelling of 827990645 in words is "eight hundred twenty-seven million, nine hundred ninety thousand, six hundred forty-five".