987890840 has 32 divisors (see below), whose sum is σ = 2236405680. Its totient is φ = 392729472.

The previous prime is 987890837. The next prime is 987890843. The reversal of 987890840 is 48098789.

It is an interprime number because it is at equal distance from previous prime (987890837) and next prime (987890843).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987890843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69239 + ... + 82278.

Almost surely, 2^987890840 is an apocalyptic number.

It is an amenable number.

987890840 is an abundant number, since it is smaller than the sum of its proper divisors (1248514840).

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

987890840 is a wasteful number, since it uses less digits than its factorization.

987890840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151691 (or 151687 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 987890840 is about 31430.7308219201. The cubic root of 987890840 is about 995.9472104191.

The spelling of 987890840 in words is "nine hundred eighty-seven million, eight hundred ninety thousand, eight hundred forty".