55915578 has 12 divisors (see below), whose sum is σ = 121150458. Its totient is φ = 18638520.

The previous prime is 55915577. The next prime is 55915579. The reversal of 55915578 is 87551955.

55915578 is a `hidden beast` number, since 5 + 5 + 91 + 557 + 8 = 666.

55915578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55915577) and next prime (55915579).

It can be written as a sum of positive squares in only one way, i.e., 51365889 + 4549689 = 7167^2 + 2133^2 .

It is not an unprimeable number, because it can be changed into a prime (55915577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1553193 + ... + 1553228.

Almost surely, 2^55915578 is an apocalyptic number.

55915578 is an abundant number, since it is smaller than the sum of its proper divisors (65234880).

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

55915578 is a wasteful number, since it uses less digits than its factorization.

55915578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106429 (or 3106426 counting only the distinct ones).

The product of its digits is 315000, while the sum is 45.

The square root of 55915578 is about 7477.6719639203. The cubic root of 55915578 is about 382.3938857250.

The spelling of 55915578 in words is "fifty-five million, nine hundred fifteen thousand, five hundred seventy-eight".