72157887 has 12 divisors (see below), whose sum is σ = 107822520. Its totient is φ = 46446288.

The previous prime is 72157873. The next prime is 72157901. The reversal of 72157887 is 78875127.

72157887 is a `hidden beast` number, since 72 + 1 + 578 + 8 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (72157873) and next prime (72157901).

It is not a de Polignac number, because 72157887 - 2⁶ = 72157823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72157817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137973 + ... + 138494.

It is an arithmetic number, because the mean of its divisors is an integer number (8985210).

Almost surely, 2^72157887 is an apocalyptic number.

72157887 is a deficient number, since it is larger than the sum of its proper divisors (35664633).

72157887 is a wasteful number, since it uses less digits than its factorization.

72157887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276502 (or 276499 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 72157887 is about 8494.5798601226. The cubic root of 72157887 is about 416.3206335239.

The spelling of 72157887 in words is "seventy-two million, one hundred fifty-seven thousand, eight hundred eighty-seven".