87123520 has 112 divisors (see below), whose sum is σ = 231087168. Its totient is φ = 31016960.

The previous prime is 87123499. The next prime is 87123541. The reversal of 87123520 is 2532178.

It is an interprime number because it is at equal distance from previous prime (87123499) and next prime (87123541).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186327 + ... + 186793.

Almost surely, 2^87123520 is an apocalyptic number.

87123520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87123520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115543584).

87123520 is an abundant number, since it is smaller than the sum of its proper divisors (143963648).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87123520 is a wasteful number, since it uses less digits than its factorization.

87123520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 87123520 is about 9333.9980715661. The cubic root of 87123520 is about 443.3143653043.

Adding to 87123520 its reverse (2532178), we get a palindrome (89655698).

The spelling of 87123520 in words is "eighty-seven million, one hundred twenty-three thousand, five hundred twenty".