55745520 has 80 divisors (see below), whose sum is σ = 173560320. Its totient is φ = 14801152.

The previous prime is 55745509. The next prime is 55745531. The reversal of 55745520 is 2554755.

It is an interprime number because it is at equal distance from previous prime (55745509) and next prime (55745531).

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

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, 85837 + ... + 86483.

It is an arithmetic number, because the mean of its divisors is an integer number (2169504).

Almost surely, 2^55745520 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 55745520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86780160).

55745520 is an abundant number, since it is smaller than the sum of its proper divisors (117814800).

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

55745520 is a wasteful number, since it uses less digits than its factorization.

55745520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022 (or 1016 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 33.

The square root of 55745520 is about 7466.2922525173. The cubic root of 55745520 is about 382.0058294296.

It can be divided in two parts, 55745 and 520, that added together give a palindrome (56265).

The spelling of 55745520 in words is "fifty-five million, seven hundred forty-five thousand, five hundred twenty".