55997340 has 48 divisors (see below), whose sum is σ = 179192832. Its totient is φ = 12799296.

The previous prime is 55997339. The next prime is 55997363. The reversal of 55997340 is 4379955.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 55997292 and 55997301.

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, 66244 + ... + 67083.

It is an arithmetic number, because the mean of its divisors is an integer number (3733184).

Almost surely, 2^55997340 is an apocalyptic number.

It is an amenable number.

55997340 is an abundant number, since it is smaller than the sum of its proper divisors (123195492).

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

55997340 is a wasteful number, since it uses less digits than its factorization.

55997340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133346 (or 133344 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 42.

The square root of 55997340 is about 7483.1370427114. The cubic root of 55997340 is about 382.5801788432.

The spelling of 55997340 in words is "fifty-five million, nine hundred ninety-seven thousand, three hundred forty".