55978840 has 16 divisors (see below), whose sum is σ = 125952480. Its totient is φ = 22391520.

The previous prime is 55978837. The next prime is 55978843. The reversal of 55978840 is 4887955.

55978840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55978837) and next prime (55978843).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55978843) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 699696 + ... + 699775.

It is an arithmetic number, because the mean of its divisors is an integer number (7872030).

Almost surely, 2^55978840 is an apocalyptic number.

It is an amenable number.

55978840 is an abundant number, since it is smaller than the sum of its proper divisors (69973640).

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

55978840 is a wasteful number, since it uses less digits than its factorization.

55978840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399482 (or 1399478 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 55978840 is about 7481.9008279982. The cubic root of 55978840 is about 382.5380428364.

The spelling of 55978840 in words is "fifty-five million, nine hundred seventy-eight thousand, eight hundred forty".