55917890 has 32 divisors (see below), whose sum is σ = 115655040. Its totient is φ = 19067904.

The previous prime is 55917889. The next prime is 55917923. The reversal of 55917890 is 9871955.

It is a happy number.

55917890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11441 + ... + 15579.

It is an arithmetic number, because the mean of its divisors is an integer number (3614220).

Almost surely, 2^55917890 is an apocalyptic number.

55917890 is an abundant number, since it is smaller than the sum of its proper divisors (59737150).

55917890 is a wasteful number, since it uses less digits than its factorization.

55917890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 55917890 is about 7477.8265558918. The cubic root of 55917890 is about 382.3991560660.

The spelling of 55917890 in words is "fifty-five million, nine hundred seventeen thousand, eight hundred ninety".