72790138 has 4 divisors (see below), whose sum is σ = 109185210. Its totient is φ = 36395068.

The previous prime is 72790127. The next prime is 72790181. The reversal of 72790138 is 83109727.

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., 64593369 + 8196769 = 8037^2 + 2863^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72790097 and 72790106.

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 as a sum of consecutive naturals, namely, 18197533 + ... + 18197536.

Almost surely, 2^72790138 is an apocalyptic number.

72790138 is a deficient number, since it is larger than the sum of its proper divisors (36395072).

72790138 is a wasteful number, since it uses less digits than its factorization.

72790138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36395071.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 72790138 is about 8531.7136613930. The cubic root of 72790138 is about 417.5330400424.

The spelling of 72790138 in words is "seventy-two million, seven hundred ninety thousand, one hundred thirty-eight".