72158938 has 4 divisors (see below), whose sum is σ = 108238410. Its totient is φ = 36079468.

The previous prime is 72158921. The next prime is 72158951. The reversal of 72158938 is 83985127.

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., 72131049 + 27889 = 8493^2 + 167^2 .

It is a junction number, because it is equal to n+sod(n) for n = 72158894 and 72158903.

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, 18039733 + ... + 18039736.

Almost surely, 2^72158938 is an apocalyptic number.

72158938 is a deficient number, since it is larger than the sum of its proper divisors (36079472).

72158938 is a wasteful number, since it uses less digits than its factorization.

72158938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36079471.

The product of its digits is 120960, while the sum is 43.

The square root of 72158938 is about 8494.6417228745. The cubic root of 72158938 is about 416.3226547899.

The spelling of 72158938 in words is "seventy-two million, one hundred fifty-eight thousand, nine hundred thirty-eight".