990871625 has 32 divisors (see below), whose sum is σ = 1318007808. Its totient is φ = 741998400.

The previous prime is 990871619. The next prime is 990871627. The reversal of 990871625 is 526178099.

It is not a de Polignac number, because 990871625 - 2⁶ = 990871561 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 990871625.

It is not an unprimeable number, because it can be changed into a prime (990871627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131459 + ... + 138791.

It is an arithmetic number, because the mean of its divisors is an integer number (41187744).

Almost surely, 2^990871625 is an apocalyptic number.

It is an amenable number.

990871625 is a deficient number, since it is larger than the sum of its proper divisors (327136183).

990871625 is a wasteful number, since it uses less digits than its factorization.

990871625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7418 (or 7408 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 990871625 is about 31478.1134282218. The cubic root of 990871625 is about 996.9479025113.

The spelling of 990871625 in words is "nine hundred ninety million, eight hundred seventy-one thousand, six hundred twenty-five".