79999970 has 16 divisors (see below), whose sum is σ = 145973880. Its totient is φ = 31561344.

The previous prime is 79999879. The next prime is 79999973. The reversal of 79999970 is 7999997.

It can be written as a sum of positive squares in 4 ways, for example, as 42680089 + 37319881 = 6533^2 + 6109^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79999973) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54065 + ... + 55524.

Almost surely, 2^79999970 is an apocalyptic number.

79999970 is a deficient number, since it is larger than the sum of its proper divisors (65973910).

79999970 is a wasteful number, since it uses less digits than its factorization.

79999970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109669.

The product of its (nonzero) digits is 2893401, while the sum is 59.

The square root of 79999970 is about 8944.2702329480. The cubic root of 79999970 is about 430.8868841455.

The spelling of 79999970 in words is "seventy-nine million, nine hundred ninety-nine thousand, nine hundred seventy".