990173664 has 36 divisors (see below), whose sum is σ = 2815807176. Its totient is φ = 330057792.

The previous prime is 990173663. The next prime is 990173669. The reversal of 990173664 is 466371099.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990173663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1718764 + ... + 1719339.

It is an arithmetic number, because the mean of its divisors is an integer number (78216866).

Almost surely, 2^990173664 is an apocalyptic number.

It is an amenable number.

990173664 is an abundant number, since it is smaller than the sum of its proper divisors (1825633512).

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

990173664 is a wasteful number, since it uses less digits than its factorization.

990173664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438119 (or 3438108 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 990173664 is about 31467.0250262080. The cubic root of 990173664 is about 996.7137671702.

The spelling of 990173664 in words is "nine hundred ninety million, one hundred seventy-three thousand, six hundred sixty-four".