55385590 has 32 divisors (see below), whose sum is σ = 108591840. Its totient is φ = 20216064.

The previous prime is 55385579. The next prime is 55385593. The reversal of 55385590 is 9558355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55385593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9177 + ... + 13963.

It is an arithmetic number, because the mean of its divisors is an integer number (3393495).

Almost surely, 2^55385590 is an apocalyptic number.

55385590 is a deficient number, since it is larger than the sum of its proper divisors (53206250).

55385590 is a wasteful number, since it uses less digits than its factorization.

55385590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4896.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 55385590 is about 7442.1495550681. The cubic root of 55385590 is about 381.1818926982.

The spelling of 55385590 in words is "fifty-five million, three hundred eighty-five thousand, five hundred ninety".