55745778 has 32 divisors (see below), whose sum is σ = 122234112. Its totient is φ = 16808400.

The previous prime is 55745749. The next prime is 55745779. The reversal of 55745778 is 87754755.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55745779) 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, 11925 + ... + 15927.

It is an arithmetic number, because the mean of its divisors is an integer number (3819816).

Almost surely, 2^55745778 is an apocalyptic number.

55745778 is an abundant number, since it is smaller than the sum of its proper divisors (66488334).

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

55745778 is a wasteful number, since it uses less digits than its factorization.

55745778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230.

The product of its digits is 1372000, while the sum is 48.

The square root of 55745778 is about 7466.3095301494. The cubic root of 55745778 is about 382.0064187586.

The spelling of 55745778 in words is "fifty-five million, seven hundred forty-five thousand, seven hundred seventy-eight".