87931940 has 12 divisors (see below), whose sum is σ = 184657116. Its totient is φ = 35172768.

The previous prime is 87931853. The next prime is 87931951. The reversal of 87931940 is 4913978.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41036836 + 46895104 = 6406^2 + 6848^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2198279 + ... + 2198318.

It is an arithmetic number, because the mean of its divisors is an integer number (15388093).

Almost surely, 2^87931940 is an apocalyptic number.

It is an amenable number.

87931940 is an abundant number, since it is smaller than the sum of its proper divisors (96725176).

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

87931940 is a wasteful number, since it uses less digits than its factorization.

87931940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396606 (or 4396604 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 87931940 is about 9377.2032077800. The cubic root of 87931940 is about 444.6813187776.

The spelling of 87931940 in words is "eighty-seven million, nine hundred thirty-one thousand, nine hundred forty".