72187457 has 8 divisors (see below), whose sum is σ = 76640256. Its totient is φ = 67757632.

The previous prime is 72187439. The next prime is 72187463. The reversal of 72187457 is 75478127.

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 72187457 - 2⁸ = 72187201 is a prime.

It is a super-2 number, since 2×72187457² = 10422057896253698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72187487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968 + ... + 12054.

It is an arithmetic number, because the mean of its divisors is an integer number (9580032).

Almost surely, 2^72187457 is an apocalyptic number.

It is an amenable number.

72187457 is a deficient number, since it is larger than the sum of its proper divisors (4452799).

72187457 is a wasteful number, since it uses less digits than its factorization.

72187457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11487.

The product of its digits is 109760, while the sum is 41.

The square root of 72187457 is about 8496.3202034763. The cubic root of 72187457 is about 416.3774945750.

The spelling of 72187457 in words is "seventy-two million, one hundred eighty-seven thousand, four hundred fifty-seven".