79921616 has 10 divisors (see below), whose sum is σ = 154848162. Its totient is φ = 39960800.

The previous prime is 79921601. The next prime is 79921631. The reversal of 79921616 is 61612997.

It is an interprime number because it is at equal distance from previous prime (79921601) and next prime (79921631).

It can be written as a sum of positive squares in only one way, i.e., 79566400 + 355216 = 8920^2 + 596^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2497535 + ... + 2497566.

Almost surely, 2^79921616 is an apocalyptic number.

It is an amenable number.

79921616 is a deficient number, since it is larger than the sum of its proper divisors (74926546).

79921616 is a wasteful number, since it uses less digits than its factorization.

79921616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995109 (or 4995103 counting only the distinct ones).

The product of its digits is 40824, while the sum is 41.

The square root of 79921616 is about 8939.8890373427. The cubic root of 79921616 is about 430.7461643457.

The spelling of 79921616 in words is "seventy-nine million, nine hundred twenty-one thousand, six hundred sixteen".