55651440 has 80 divisors (see below), whose sum is σ = 185800608. Its totient is φ = 13698048.

The previous prime is 55651439. The next prime is 55651451. The reversal of 55651440 is 4415655.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55651398 and 55651407.

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 15 ways as a sum of consecutive naturals, for example, 5799 + ... + 12038.

Almost surely, 2^55651440 is an apocalyptic number.

It is an amenable number.

55651440 is an abundant number, since it is smaller than the sum of its proper divisors (130149168).

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

55651440 is a wasteful number, since it uses less digits than its factorization.

55651440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17866 (or 17860 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 55651440 is about 7459.9892761317. The cubic root of 55651440 is about 381.7908085921.

The spelling of 55651440 in words is "fifty-five million, six hundred fifty-one thousand, four hundred forty".