55757890 has 16 divisors (see below), whose sum is σ = 103077432. Its totient is φ = 21700224.

The previous prime is 55757881. The next prime is 55757939. The reversal of 55757890 is 9875755.

It can be written as a sum of positive squares in 4 ways, for example, as 55547209 + 210681 = 7453^2 + 459^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55757890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74979 + ... + 75718.

Almost surely, 2^55757890 is an apocalyptic number.

55757890 is a deficient number, since it is larger than the sum of its proper divisors (47319542).

55757890 is a wasteful number, since it uses less digits than its factorization.

55757890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150741.

The product of its (nonzero) digits is 441000, while the sum is 46.

The square root of 55757890 is about 7467.1205963209. The cubic root of 55757890 is about 382.0340831956.

The spelling of 55757890 in words is "fifty-five million, seven hundred fifty-seven thousand, eight hundred ninety".