79681649 has 8 divisors (see below), whose sum is σ = 84084000. Its totient is φ = 75300192.

The previous prime is 79681639. The next prime is 79681673. The reversal of 79681649 is 94618697.

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

It is a de Polignac number, because none of the positive numbers 2^k-79681649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79681597 and 79681606.

It is not an unprimeable number, because it can be changed into a prime (79681639) 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, 2957 + ... + 12965.

It is an arithmetic number, because the mean of its divisors is an integer number (10510500).

Almost surely, 2^79681649 is an apocalyptic number.

It is an amenable number.

79681649 is a deficient number, since it is larger than the sum of its proper divisors (4402351).

79681649 is a wasteful number, since it uses less digits than its factorization.

79681649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10447.

The product of its digits is 653184, while the sum is 50.

The square root of 79681649 is about 8926.4578081118. The cubic root of 79681649 is about 430.3146228141.

The spelling of 79681649 in words is "seventy-nine million, six hundred eighty-one thousand, six hundred forty-nine".