87643940 has 12 divisors (see below), whose sum is σ = 184052316. Its totient is φ = 35057568.

The previous prime is 87643909. The next prime is 87643951. The reversal of 87643940 is 4934678.

It can be written as a sum of positive squares in 2 ways, for example, as 51955264 + 35688676 = 7208^2 + 5974^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2191079 + ... + 2191118.

It is an arithmetic number, because the mean of its divisors is an integer number (15337693).

Almost surely, 2^87643940 is an apocalyptic number.

It is an amenable number.

87643940 is an abundant number, since it is smaller than the sum of its proper divisors (96408376).

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

87643940 is a wasteful number, since it uses less digits than its factorization.

87643940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382206 (or 4382204 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 87643940 is about 9361.8342219888. The cubic root of 87643940 is about 444.1953054143.

The spelling of 87643940 in words is "eighty-seven million, six hundred forty-three thousand, nine hundred forty".