55547780 has 24 divisors (see below), whose sum is σ = 116833752. Its totient is φ = 22184192.

The previous prime is 55547777. The next prime is 55547801. The reversal of 55547780 is 8774555.

It can be written as a sum of positive squares in 4 ways, for example, as 75076 + 55472704 = 274^2 + 7448^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13664 + ... + 17256.

It is an arithmetic number, because the mean of its divisors is an integer number (4868073).

Almost surely, 2^55547780 is an apocalyptic number.

It is an amenable number.

55547780 is an abundant number, since it is smaller than the sum of its proper divisors (61285972).

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

55547780 is a wasteful number, since it uses less digits than its factorization.

55547780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375 (or 4373 counting only the distinct ones).

The product of its (nonzero) digits is 196000, while the sum is 41.

The square root of 55547780 is about 7453.0383066237. The cubic root of 55547780 is about 381.5536117755.

The spelling of 55547780 in words is "fifty-five million, five hundred forty-seven thousand, seven hundred eighty".