987770640 has 80 divisors (see below), whose sum is σ = 3065875200. Its totient is φ = 263079936.

The previous prime is 987770603. The next prime is 987770677. The reversal of 987770640 is 46077789.

It is an interprime number because it is at equal distance from previous prime (987770603) and next prime (987770677).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 987770640.

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 15 ways as a sum of consecutive naturals, for example, 240121 + ... + 244199.

It is an arithmetic number, because the mean of its divisors is an integer number (38323440).

Almost surely, 2^987770640 is an apocalyptic number.

It is an amenable number.

987770640 is an abundant number, since it is smaller than the sum of its proper divisors (2078104560).

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

987770640 is a wasteful number, since it uses less digits than its factorization.

987770640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104 (or 5098 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 48.

The square root of 987770640 is about 31428.8186224045. The cubic root of 987770640 is about 995.9068153655.

The spelling of 987770640 in words is "nine hundred eighty-seven million, seven hundred seventy thousand, six hundred forty".