87123537 has 6 divisors (see below), whose sum is σ = 125845122. Its totient is φ = 58082352.

The previous prime is 87123499. The next prime is 87123541. The reversal of 87123537 is 73532178.

It can be written as a sum of positive squares in only one way, i.e., 70157376 + 16966161 = 8376^2 + 4119^2 .

It is not a de Polignac number, because 87123537 - 2⁷ = 87123409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87123587) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4840188 + ... + 4840205.

It is an arithmetic number, because the mean of its divisors is an integer number (20974187).

Almost surely, 2^87123537 is an apocalyptic number.

It is an amenable number.

87123537 is a deficient number, since it is larger than the sum of its proper divisors (38721585).

87123537 is a wasteful number, since it uses less digits than its factorization.

87123537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9680399 (or 9680396 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 87123537 is about 9333.9989822155. The cubic root of 87123537 is about 443.3143941382.

The spelling of 87123537 in words is "eighty-seven million, one hundred twenty-three thousand, five hundred thirty-seven".