55631890 has 16 divisors (see below), whose sum is σ = 100514520. Its totient is φ = 22168960.

The previous prime is 55631881. The next prime is 55631897. The reversal of 55631890 is 9813655.

It can be written as a sum of positive squares in 4 ways, for example, as 17969121 + 37662769 = 4239^2 + 6137^2 .

It is not an unprimeable number, because it can be changed into a prime (55631897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7651 + ... + 13030.

Almost surely, 2^55631890 is an apocalyptic number.

55631890 is a deficient number, since it is larger than the sum of its proper divisors (44882630).

55631890 is a wasteful number, since it uses less digits than its factorization.

55631890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20957.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 55631890 is about 7458.6788374350. The cubic root of 55631890 is about 381.7460964547.

The spelling of 55631890 in words is "fifty-five million, six hundred thirty-one thousand, eight hundred ninety".