55371890 has 128 divisors (see below), whose sum is σ = 132710400. Its totient is φ = 16174080.

The previous prime is 55371889. The next prime is 55371923. The reversal of 55371890 is 9817355.

55371890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

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 63 ways as a sum of consecutive naturals, for example, 700871 + ... + 700949.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^55371890 is an apocalyptic number.

55371890 is an abundant number, since it is smaller than the sum of its proper divisors (77338510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55371890 is a wasteful number, since it uses less digits than its factorization.

55371890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 55371890 is about 7441.2290651478. The cubic root of 55371890 is about 381.1504608006.

The spelling of 55371890 in words is "fifty-five million, three hundred seventy-one thousand, eight hundred ninety".