72271457 has 4 divisors (see below), whose sum is σ = 72338436. Its totient is φ = 72204480.

The previous prime is 72271439. The next prime is 72271481. The reversal of 72271457 is 75417227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75417227 = 43 ⋅1753889.

It can be written as a sum of positive squares in 2 ways, for example, as 30294016 + 41977441 = 5504^2 + 6479^2 .

It is a cyclic number.

It is not a de Polignac number, because 72271457 - 2⁸ = 72271201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72271057) 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, 31844 + ... + 34037.

It is an arithmetic number, because the mean of its divisors is an integer number (18084609).

Almost surely, 2^72271457 is an apocalyptic number.

It is an amenable number.

72271457 is a deficient number, since it is larger than the sum of its proper divisors (66979).

72271457 is a wasteful number, since it uses less digits than its factorization.

72271457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66978.

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

The square root of 72271457 is about 8501.2620827734. The cubic root of 72271457 is about 416.5389360655.

The spelling of 72271457 in words is "seventy-two million, two hundred seventy-one thousand, four hundred fifty-seven".