990179280 has 120 divisors (see below), whose sum is σ = 3521004552. Its totient is φ = 248512512.

The previous prime is 990179261. The next prime is 990179287. The reversal of 990179280 is 82971099.

It can be written as a sum of positive squares in 4 ways, for example, as 417630096 + 572549184 = 20436^2 + 23928^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990179287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28209 + ... + 52688.

Almost surely, 2^990179280 is an apocalyptic number.

990179280 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

990179280 is an abundant number, since it is smaller than the sum of its proper divisors (2530825272).

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

990179280 is a wasteful number, since it uses less digits than its factorization.

990179280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80933 (or 80924 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 990179280 is about 31467.1142623533. The cubic root of 990179280 is about 996.7156515312.

The spelling of 990179280 in words is "nine hundred ninety million, one hundred seventy-nine thousand, two hundred eighty".