55400730 has 128 divisors (see below), whose sum is σ = 171694080. Its totient is φ = 11101440.

The previous prime is 55400699. The next prime is 55400743. The reversal of 55400730 is 3700455.

55400730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 55400730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66577 + ... + 67403.

It is an arithmetic number, because the mean of its divisors is an integer number (1341360).

Almost surely, 2^55400730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55400730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85847040).

55400730 is an abundant number, since it is smaller than the sum of its proper divisors (116293350).

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

55400730 is a wasteful number, since it uses less digits than its factorization.

55400730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 2100, while the sum is 24.

The square root of 55400730 is about 7443.1666648007. The cubic root of 55400730 is about 381.2166223579.

The spelling of 55400730 in words is "fifty-five million, four hundred thousand, seven hundred thirty".