55813990 has 16 divisors (see below), whose sum is σ = 101029680. Its totient is φ = 22200160.

The previous prime is 55813969. The next prime is 55813999. The reversal of 55813990 is 9931855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55813999) 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, 13801 + ... + 17380.

It is an arithmetic number, because the mean of its divisors is an integer number (6314355).

Almost surely, 2^55813990 is an apocalyptic number.

55813990 is a deficient number, since it is larger than the sum of its proper divisors (45215690).

55813990 is a wasteful number, since it uses less digits than its factorization.

55813990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31367.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 55813990 is about 7470.8761199741. The cubic root of 55813990 is about 382.1621662837.

The spelling of 55813990 in words is "fifty-five million, eight hundred thirteen thousand, nine hundred ninety".