79621905 has 32 divisors (see below), whose sum is σ = 139696128. Its totient is φ = 38404800.

The previous prime is 79621873. The next prime is 79621921. The reversal of 79621905 is 50912697.

It is not a de Polignac number, because 79621905 - 2⁵ = 79621873 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33672 + ... + 35958.

It is an arithmetic number, because the mean of its divisors is an integer number (4365504).

Almost surely, 2^79621905 is an apocalyptic number.

It is an amenable number.

79621905 is a deficient number, since it is larger than the sum of its proper divisors (60074223).

79621905 is a wasteful number, since it uses less digits than its factorization.

79621905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 79621905 is about 8923.1107244055. The cubic root of 79621905 is about 430.2070482966.

The spelling of 79621905 in words is "seventy-nine million, six hundred twenty-one thousand, nine hundred five".