55345720 has 32 divisors (see below), whose sum is σ = 125025120. Its totient is φ = 22049920.

The previous prime is 55345669. The next prime is 55345723. The reversal of 55345720 is 2754355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55345723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7890 + ... + 13150.

It is an arithmetic number, because the mean of its divisors is an integer number (3907035).

Almost surely, 2^55345720 is an apocalyptic number.

It is an amenable number.

55345720 is an abundant number, since it is smaller than the sum of its proper divisors (69679400).

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

55345720 is a wasteful number, since it uses less digits than its factorization.

55345720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5535 (or 5531 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 55345720 is about 7439.4704112591. The cubic root of 55345720 is about 381.0904045796.

It can be divided in two parts, 55345 and 720, that added together give a palindrome (56065).

The spelling of 55345720 in words is "fifty-five million, three hundred forty-five thousand, seven hundred twenty".