55861440 has 56 divisors (see below), whose sum is σ = 177363120. Its totient is φ = 14896128.

The previous prime is 55861409. The next prime is 55861447. The reversal of 55861440 is 4416855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55861447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28135 + ... + 30054.

Almost surely, 2^55861440 is an apocalyptic number.

It is an amenable number.

55861440 is an abundant number, since it is smaller than the sum of its proper divisors (121501680).

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

55861440 is a wasteful number, since it uses less digits than its factorization.

55861440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58209 (or 58199 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 55861440 is about 7474.0511103417. The cubic root of 55861440 is about 382.2704333955.

The spelling of 55861440 in words is "fifty-five million, eight hundred sixty-one thousand, four hundred forty".