72179257 has 4 divisors (see below), whose sum is σ = 72199936. Its totient is φ = 72158580.

The previous prime is 72179251. The next prime is 72179273. The reversal of 72179257 is 75297127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75297127 = 167 ⋅450881.

It is a cyclic number.

It is not a de Polignac number, because 72179257 - 2³ = 72179249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72179251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3669 + ... + 12562.

It is an arithmetic number, because the mean of its divisors is an integer number (18049984).

Almost surely, 2^72179257 is an apocalyptic number.

It is an amenable number.

72179257 is a deficient number, since it is larger than the sum of its proper divisors (20679).

72179257 is a wasteful number, since it uses less digits than its factorization.

72179257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20678.

The product of its digits is 61740, while the sum is 40.

The square root of 72179257 is about 8495.8376279211. The cubic root of 72179257 is about 416.3617281022.

The spelling of 72179257 in words is "seventy-two million, one hundred seventy-nine thousand, two hundred fifty-seven".