87979977440 has 48 divisors (see below), whose sum is σ = 208371184560. Its totient is φ = 35104204800.

The previous prime is 87979977431. The next prime is 87979977539. The reversal of 87979977440 is 4477997978.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621470 + ... + 749789.

It is an arithmetic number, because the mean of its divisors is an integer number (4341066345).

Almost surely, 2^87979977440 is an apocalyptic number.

87979977440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87979977440 is an abundant number, since it is smaller than the sum of its proper divisors (120391207120).

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

87979977440 is a wasteful number, since it uses less digits than its factorization.

87979977440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371675 (or 1371667 counting only the distinct ones).

The product of its (nonzero) digits is 224042112, while the sum is 71.

The spelling of 87979977440 in words is "eighty-seven billion, nine hundred seventy-nine million, nine hundred seventy-seven thousand, four hundred forty".