72472157 has 4 divisors (see below), whose sum is σ = 74157600. Its totient is φ = 70786716.

The previous prime is 72472129. The next prime is 72472193. The reversal of 72472157 is 75127427.

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: 75127427 = 37 ⋅2030471.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72472157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72472117) 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, 842657 + ... + 842742.

It is an arithmetic number, because the mean of its divisors is an integer number (18539400).

Almost surely, 2^72472157 is an apocalyptic number.

It is an amenable number.

72472157 is a deficient number, since it is larger than the sum of its proper divisors (1685443).

72472157 is a wasteful number, since it uses less digits than its factorization.

72472157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685442.

The product of its digits is 27440, while the sum is 35.

The square root of 72472157 is about 8513.0580286992. The cubic root of 72472157 is about 416.9241600582.

The spelling of 72472157 in words is "seventy-two million, four hundred seventy-two thousand, one hundred fifty-seven".