55561808 has 20 divisors (see below), whose sum is σ = 109683828. Its totient is φ = 27256320.

The previous prime is 55561787. The next prime is 55561837. The reversal of 55561808 is 80816555.

It can be written as a sum of positive squares in 2 ways, for example, as 36096064 + 19465744 = 6008^2 + 4412^2 .

It is a super-2 number, since 2×55561808² = 6174229016457728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31913 + ... + 33608.

Almost surely, 2^55561808 is an apocalyptic number.

It is an amenable number.

55561808 is a deficient number, since it is larger than the sum of its proper divisors (54122020).

55561808 is a wasteful number, since it uses less digits than its factorization.

55561808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65582 (or 65576 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 38.

The square root of 55561808 is about 7453.9793399231. The cubic root of 55561808 is about 381.5857281719.

The spelling of 55561808 in words is "fifty-five million, five hundred sixty-one thousand, eight hundred eight".