55812720 has 80 divisors (see below), whose sum is σ = 180559872. Its totient is φ = 14234880.

The previous prime is 55812719. The next prime is 55812727. The reversal of 55812720 is 2721855.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55812727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465 + ... + 10575.

Almost surely, 2^55812720 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 55812720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90279936).

55812720 is an abundant number, since it is smaller than the sum of its proper divisors (124747152).

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

55812720 is a wasteful number, since it uses less digits than its factorization.

55812720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10150 (or 10144 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 55812720 is about 7470.7911227660. The cubic root of 55812720 is about 382.1592676697.

The spelling of 55812720 in words is "fifty-five million, eight hundred twelve thousand, seven hundred twenty".