72257457 has 8 divisors (see below), whose sum is σ = 98693280. Its totient is φ = 46996640.

The previous prime is 72257447. The next prime is 72257461. The reversal of 72257457 is 75475227.

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

It is a cyclic number.

It is not a de Polignac number, because 72257457 - 2⁴ = 72257441 is a prime.

It is a super-2 number, since 2×72257457² = 10442280184213698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72257407) 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, 293607 + ... + 293852.

It is an arithmetic number, because the mean of its divisors is an integer number (12336660).

Almost surely, 2^72257457 is an apocalyptic number.

It is an amenable number.

72257457 is a deficient number, since it is larger than the sum of its proper divisors (26435823).

72257457 is a wasteful number, since it uses less digits than its factorization.

72257457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587503.

The product of its digits is 137200, while the sum is 39.

The square root of 72257457 is about 8500.4386357411. The cubic root of 72257457 is about 416.5120378407.

The spelling of 72257457 in words is "seventy-two million, two hundred fifty-seven thousand, four hundred fifty-seven".