990949680 has 160 divisors (see below), whose sum is σ = 3900940800. Its totient is φ = 226499328.

The previous prime is 990949667. The next prime is 990949721. The reversal of 990949680 is 86949099.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17650 + ... + 47889.

It is an arithmetic number, because the mean of its divisors is an integer number (24380880).

Almost surely, 2^990949680 is an apocalyptic number.

990949680 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

990949680 is an abundant number, since it is smaller than the sum of its proper divisors (2909991120).

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

990949680 is a wasteful number, since it uses less digits than its factorization.

990949680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65568 (or 65556 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 990949680 is about 31479.3532335085. The cubic root of 990949680 is about 996.9740797084.

The spelling of 990949680 in words is "nine hundred ninety million, nine hundred forty-nine thousand, six hundred eighty".