87150721940 has 24 divisors (see below), whose sum is σ = 183023404200. Its totient is φ = 34858976768.

The previous prime is 87150721907. The next prime is 87150721943. The reversal of 87150721940 is 4912705178.

It can be written as a sum of positive squares in 4 ways, for example, as 7217861764 + 79932860176 = 84958^2 + 282724^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87150721891 and 87150721900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87150721943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601736 + ... + 732384.

It is an arithmetic number, because the mean of its divisors is an integer number (7625975175).

Almost surely, 2^87150721940 is an apocalyptic number.

It is an amenable number.

87150721940 is an abundant number, since it is smaller than the sum of its proper divisors (95872682260).

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

87150721940 is a wasteful number, since it uses less digits than its factorization.

87150721940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164011 (or 164009 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 44.

The spelling of 87150721940 in words is "eighty-seven billion, one hundred fifty million, seven hundred twenty-one thousand, nine hundred forty".