990021650 has 24 divisors (see below), whose sum is σ = 1849167360. Its totient is φ = 394346960.

The previous prime is 990021623. The next prime is 990021667. The reversal of 990021650 is 56120099.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29474 + ... + 53373.

It is an arithmetic number, because the mean of its divisors is an integer number (77048640).

Almost surely, 2^990021650 is an apocalyptic number.

990021650 is a deficient number, since it is larger than the sum of its proper divisors (859145710).

990021650 is a wasteful number, since it uses less digits than its factorization.

990021650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83098 (or 83093 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 990021650 is about 31464.6094843079. The cubic root of 990021650 is about 996.6627585419.

The spelling of 990021650 in words is "nine hundred ninety million, twenty-one thousand, six hundred fifty".