987825820 has 24 divisors (see below), whose sum is σ = 2086030800. Its totient is φ = 392921472.

The previous prime is 987825793. The next prime is 987825821. The reversal of 987825820 is 28528789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987825821) 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, 134385 + ... + 141544.

It is an arithmetic number, because the mean of its divisors is an integer number (86917950).

Almost surely, 2^987825820 is an apocalyptic number.

It is an amenable number.

987825820 is an abundant number, since it is smaller than the sum of its proper divisors (1098204980).

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

987825820 is a wasteful number, since it uses less digits than its factorization.

987825820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276117 (or 276115 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 49.

The square root of 987825820 is about 31429.6964668767. The cubic root of 987825820 is about 995.9253598577.

The spelling of 987825820 in words is "nine hundred eighty-seven million, eight hundred twenty-five thousand, eight hundred twenty".