79619881 has 8 divisors (see below), whose sum is σ = 87413184. Its totient is φ = 71919120.

The previous prime is 79619867. The next prime is 79619887. The reversal of 79619881 is 18891697.

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

It is a cyclic number.

It is not a de Polignac number, because 79619881 - 2⁹ = 79619369 is a prime.

It is a super-2 number, since 2×79619881² = 12678650900908322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79619887) 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, 21325 + ... + 24778.

It is an arithmetic number, because the mean of its divisors is an integer number (10926648).

Almost surely, 2^79619881 is an apocalyptic number.

It is an amenable number.

79619881 is a deficient number, since it is larger than the sum of its proper divisors (7793303).

79619881 is a wasteful number, since it uses less digits than its factorization.

79619881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46271.

The product of its digits is 217728, while the sum is 49.

The square root of 79619881 is about 8922.9973103212. The cubic root of 79619881 is about 430.2034029579.

The spelling of 79619881 in words is "seventy-nine million, six hundred nineteen thousand, eight hundred eighty-one".