55657780 has 24 divisors (see below), whose sum is σ = 117038880. Its totient is φ = 22233120.

The previous prime is 55657753. The next prime is 55657793. The reversal of 55657780 is 8775655.

It is a congruent number.

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, 19015 + ... + 21745.

It is an arithmetic number, because the mean of its divisors is an integer number (4876620).

Almost surely, 2^55657780 is an apocalyptic number.

It is an amenable number.

55657780 is an abundant number, since it is smaller than the sum of its proper divisors (61381100).

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

55657780 is a wasteful number, since it uses less digits than its factorization.

55657780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759 (or 3757 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 43.

The square root of 55657780 is about 7460.4141976166. The cubic root of 55657780 is about 381.8053063411.

The spelling of 55657780 in words is "fifty-five million, six hundred fifty-seven thousand, seven hundred eighty".