55708687440 has 320 divisors, whose sum is σ = 220277329920. Its totient is φ = 12676538880.

The previous prime is 55708687399. The next prime is 55708687487. The reversal of 55708687440 is 4478680755.

55708687440 is a `hidden beast` number, since 5 + 570 + 8 + 68 + 7 + 4 + 4 + 0 = 666.

It is a super-2 number, since 2×55708687440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3424125 + ... + 3440355.

It is an arithmetic number, because the mean of its divisors is an integer number (688366656).

Almost surely, 2^55708687440 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 55708687440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110138664960).

55708687440 is an abundant number, since it is smaller than the sum of its proper divisors (164568642480).

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

55708687440 is a wasteful number, since it uses less digits than its factorization.

55708687440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16487 (or 16475 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 54.

The spelling of 55708687440 in words is "fifty-five billion, seven hundred eight million, six hundred eighty-seven thousand, four hundred forty".