55787120 has 80 divisors (see below), whose sum is σ = 136384128. Its totient is φ = 21196800.

The previous prime is 55787113. The next prime is 55787129. The reversal of 55787120 is 2178755.

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

It is a super-2 number, since 2×55787120² = 6224405515788800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55787129) 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, 138920 + ... + 139320.

Almost surely, 2^55787120 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 55787120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68192064).

55787120 is an abundant number, since it is smaller than the sum of its proper divisors (80597008).

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

55787120 is a wasteful number, since it uses less digits than its factorization.

55787120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 55787120 is about 7469.0775869581. The cubic root of 55787120 is about 382.1008295370.

The spelling of 55787120 in words is "fifty-five million, seven hundred eighty-seven thousand, one hundred twenty".