55906578 has 128 divisors (see below), whose sum is σ = 158269440. Its totient is φ = 14230080.

The previous prime is 55906567. The next prime is 55906597. The reversal of 55906578 is 87560955.

55906578 is a `hidden beast` number, since 5 + 590 + 6 + 57 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 152151 + ... + 152517.

It is an arithmetic number, because the mean of its divisors is an integer number (1236480).

Almost surely, 2^55906578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55906578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79134720).

55906578 is an abundant number, since it is smaller than the sum of its proper divisors (102362862).

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

55906578 is a wasteful number, since it uses less digits than its factorization.

55906578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 45.

The square root of 55906578 is about 7477.0701481262. The cubic root of 55906578 is about 382.3733683084.

The spelling of 55906578 in words is "fifty-five million, nine hundred six thousand, five hundred seventy-eight".