79645690 has 8 divisors (see below), whose sum is σ = 143362260. Its totient is φ = 31858272.

The previous prime is 79645669. The next prime is 79645703. The reversal of 79645690 is 9654697.

It can be written as a sum of positive squares in 2 ways, for example, as 78801129 + 844561 = 8877^2 + 919^2 .

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

It is a super-2 number, since 2×79645690² = 12686871871152200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 79645690.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3982275 + ... + 3982294.

Almost surely, 2^79645690 is an apocalyptic number.

79645690 is a deficient number, since it is larger than the sum of its proper divisors (63716570).

79645690 is a wasteful number, since it uses less digits than its factorization.

79645690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7964576.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 79645690 is about 8924.4434000110. The cubic root of 79645690 is about 430.2498818021.

The spelling of 79645690 in words is "seventy-nine million, six hundred forty-five thousand, six hundred ninety".