990689810 has 64 divisors (see below), whose sum is σ = 2050562304. Its totient is φ = 341088000.

The previous prime is 990689801. The next prime is 990689813. The reversal of 990689810 is 18986099.

It is a super-2 number, since 2×990689810² = 1962932599275672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990689813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253592 + ... + 257468.

It is an arithmetic number, because the mean of its divisors is an integer number (32040036).

Almost surely, 2^990689810 is an apocalyptic number.

990689810 is an abundant number, since it is smaller than the sum of its proper divisors (1059872494).

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

990689810 is a wasteful number, since it uses less digits than its factorization.

990689810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4019.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 990689810 is about 31475.2253367629. The cubic root of 990689810 is about 996.8869221361.

The spelling of 990689810 in words is "nine hundred ninety million, six hundred eighty-nine thousand, eight hundred ten".