990877569 has 32 divisors (see below), whose sum is σ = 1532252160. Its totient is φ = 563256000.

The previous prime is 990877567. The next prime is 990877577. The reversal of 990877569 is 965778099.

It is not a de Polignac number, because 990877569 - 2¹ = 990877567 is a prime.

It is a super-2 number, since 2×990877569² = 1963676713494699522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (990877561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55504 + ... + 71150.

It is an arithmetic number, because the mean of its divisors is an integer number (47882880).

Almost surely, 2^990877569 is an apocalyptic number.

It is an amenable number.

990877569 is a deficient number, since it is larger than the sum of its proper divisors (541374591).

990877569 is a wasteful number, since it uses less digits than its factorization.

990877569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15781.

The product of its (nonzero) digits is 8573040, while the sum is 60.

The square root of 990877569 is about 31478.2078428871. The cubic root of 990877569 is about 996.9498959907.

The spelling of 990877569 in words is "nine hundred ninety million, eight hundred seventy-seven thousand, five hundred sixty-nine".