55528502778 has 32 divisors (see below), whose sum is σ = 141024769920. Its totient is φ = 15865286400.

The previous prime is 55528502773. The next prime is 55528502933. The reversal of 55528502778 is 87720582555.

55528502778 is a `hidden beast` number, since 5 + 552 + 85 + 0 + 2 + 7 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (55528502773) 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, 73450023 + ... + 73450778.

It is an arithmetic number, because the mean of its divisors is an integer number (4407024060).

Almost surely, 2^55528502778 is an apocalyptic number.

55528502778 is an abundant number, since it is smaller than the sum of its proper divisors (85496267142).

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

55528502778 is a wasteful number, since it uses less digits than its factorization.

55528502778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146900819 (or 146900813 counting only the distinct ones).

The product of its (nonzero) digits is 7840000, while the sum is 54.

The spelling of 55528502778 in words is "fifty-five billion, five hundred twenty-eight million, five hundred two thousand, seven hundred seventy-eight".