87769640 has 64 divisors (see below), whose sum is σ = 238982400. Its totient is φ = 28320768.

The previous prime is 87769621. The next prime is 87769651. The reversal of 87769640 is 4696778.

It is a happy number.

It is a hoax number, since the sum of its digits (47) 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4460 + ... + 13979.

It is an arithmetic number, because the mean of its divisors is an integer number (3734100).

Almost surely, 2^87769640 is an apocalyptic number.

It is an amenable number.

87769640 is an abundant number, since it is smaller than the sum of its proper divisors (151212760).

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

87769640 is a wasteful number, since it uses less digits than its factorization.

87769640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18474 (or 18470 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 87769640 is about 9368.5452445937. The cubic root of 87769640 is about 444.4075607355.

The spelling of 87769640 in words is "eighty-seven million, seven hundred sixty-nine thousand, six hundred forty".