55524780 has 72 divisors (see below), whose sum is σ = 169080912. Its totient is φ = 14749056.

The previous prime is 55524773. The next prime is 55524787. The reversal of 55524780 is 8742555.

It is a happy number.

55524780 is a `hidden beast` number, since 55 + 524 + 7 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (55524773) and next prime (55524787).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55524787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66727 + ... + 67553.

It is an arithmetic number, because the mean of its divisors is an integer number (2348346).

Almost surely, 2^55524780 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 55524780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84540456).

55524780 is an abundant number, since it is smaller than the sum of its proper divisors (113556132).

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

55524780 is a wasteful number, since it uses less digits than its factorization.

55524780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The square root of 55524780 is about 7451.4951519812. The cubic root of 55524780 is about 381.5009427365.

The spelling of 55524780 in words is "fifty-five million, five hundred twenty-four thousand, seven hundred eighty".