987791836 has 48 divisors (see below), whose sum is σ = 1848188160. Its totient is φ = 460615680.

The previous prime is 987791813. The next prime is 987791839. The reversal of 987791836 is 638197789.

It is a super-2 number, since 2×987791836² = 1951465422536501792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987791839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2011551 + ... + 2012041.

It is an arithmetic number, because the mean of its divisors is an integer number (38503920).

Almost surely, 2^987791836 is an apocalyptic number.

It is an amenable number.

987791836 is a deficient number, since it is larger than the sum of its proper divisors (860396324).

987791836 is a wasteful number, since it uses less digits than its factorization.

987791836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 872 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 58.

The square root of 987791836 is about 31429.1558270342. The cubic root of 987791836 is about 995.9139388444.

The spelling of 987791836 in words is "nine hundred eighty-seven million, seven hundred ninety-one thousand, eight hundred thirty-six".