79561970 has 24 divisors (see below), whose sum is σ = 145297476. Its totient is φ = 31367808.

The previous prime is 79561943. The next prime is 79562011. The reversal of 79561970 is 7916597.

It can be written as a sum of positive squares in 6 ways, for example, as 55815841 + 23746129 = 7471^2 + 4873^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52544 + ... + 54036.

Almost surely, 2^79561970 is an apocalyptic number.

79561970 is a deficient number, since it is larger than the sum of its proper divisors (65735506).

79561970 is a wasteful number, since it uses less digits than its factorization.

79561970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 79561970 is about 8919.7516781579. The cubic root of 79561970 is about 430.0990757822.

The spelling of 79561970 in words is "seventy-nine million, five hundred sixty-one thousand, nine hundred seventy".