72371257 has 8 divisors (see below), whose sum is σ = 82775232. Its totient is φ = 61983600.

The previous prime is 72371239. The next prime is 72371281. The reversal of 72371257 is 75217327.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72371257 - 2²³ = 63982649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72371357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7707 + ... + 14287.

It is an arithmetic number, because the mean of its divisors is an integer number (10346904).

Almost surely, 2^72371257 is an apocalyptic number.

It is an amenable number.

72371257 is a deficient number, since it is larger than the sum of its proper divisors (10403975).

72371257 is a wasteful number, since it uses less digits than its factorization.

72371257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8159.

The product of its digits is 20580, while the sum is 34.

The square root of 72371257 is about 8507.1297744892. The cubic root of 72371257 is about 416.7305814130.

It can be divided in two parts, 7237 and 1257, that multiplied together give a palindrome (9096909).

The spelling of 72371257 in words is "seventy-two million, three hundred seventy-one thousand, two hundred fifty-seven".