79628138 has 4 divisors (see below), whose sum is σ = 119442210. Its totient is φ = 39814068.

The previous prime is 79628123. The next prime is 79628141. The reversal of 79628138 is 83182697.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78552769 + 1075369 = 8863^2 + 1037^2 .

It is a super-2 number, since 2×79628138² = 12681280722694088, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19907033 + ... + 19907036.

Almost surely, 2^79628138 is an apocalyptic number.

79628138 is a deficient number, since it is larger than the sum of its proper divisors (39814072).

79628138 is a wasteful number, since it uses less digits than its factorization.

79628138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39814071.

The product of its digits is 145152, while the sum is 44.

The square root of 79628138 is about 8923.4599791785. The cubic root of 79628138 is about 430.2182738949.

The spelling of 79628138 in words is "seventy-nine million, six hundred twenty-eight thousand, one hundred thirty-eight".