55597440 has 128 divisors (see below), whose sum is σ = 185068800. Its totient is φ = 14170112.

The previous prime is 55597427. The next prime is 55597453. The reversal of 55597440 is 4479555.

It is an interprime number because it is at equal distance from previous prime (55597427) and next prime (55597453).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43531 + ... + 44789.

It is an arithmetic number, because the mean of its divisors is an integer number (1445850).

Almost surely, 2^55597440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55597440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92534400).

55597440 is an abundant number, since it is smaller than the sum of its proper divisors (129471360).

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

55597440 is a wasteful number, since it uses less digits than its factorization.

55597440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The square root of 55597440 is about 7456.3690895770. The cubic root of 55597440 is about 381.6672815366.

The spelling of 55597440 in words is "fifty-five million, five hundred ninety-seven thousand, four hundred forty".