87228157 has 4 divisors (see below), whose sum is σ = 87732540. Its totient is φ = 86723776.

The previous prime is 87228149. The next prime is 87228179. The reversal of 87228157 is 75182278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79905721 + 7322436 = 8939^2 + 2706^2 .

It is a cyclic number.

It is not a de Polignac number, because 87228157 - 2³ = 87228149 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 (87228187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251932 + ... + 252277.

It is an arithmetic number, because the mean of its divisors is an integer number (21933135).

Almost surely, 2^87228157 is an apocalyptic number.

It is an amenable number.

87228157 is a deficient number, since it is larger than the sum of its proper divisors (504383).

87228157 is a wasteful number, since it uses less digits than its factorization.

87228157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504382.

The product of its digits is 62720, while the sum is 40.

The square root of 87228157 is about 9339.6015439632. The cubic root of 87228157 is about 443.4917706212.

The spelling of 87228157 in words is "eighty-seven million, two hundred twenty-eight thousand, one hundred fifty-seven".