1990880280 has 96 divisors (see below), whose sum is σ = 6475865760. Its totient is φ = 530449920.

The previous prime is 1990880279. The next prime is 1990880291. The reversal of 1990880280 is 820880991.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 830764 + ... + 833156.

It is an arithmetic number, because the mean of its divisors is an integer number (67456935).

Almost surely, 2^1990880280 is an apocalyptic number.

1990880280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990880280 is an abundant number, since it is smaller than the sum of its proper divisors (4484985480).

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

1990880280 is a wasteful number, since it uses less digits than its factorization.

1990880280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4721 (or 4714 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 1990880280 is about 44619.2814823368. The cubic root of 1990880280 is about 1258.0031105563.

The spelling of 1990880280 in words is "one billion, nine hundred ninety million, eight hundred eighty thousand, two hundred eighty".