55561830 has 32 divisors (see below), whose sum is σ = 133657344. Its totient is φ = 14782176.

The previous prime is 55561787. The next prime is 55561837. The reversal of 55561830 is 3816555.

It is a junction number, because it is equal to n+sod(n) for n = 55561791 and 55561800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561837) 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, 12709 + ... + 16511.

It is an arithmetic number, because the mean of its divisors is an integer number (4176792).

Almost surely, 2^55561830 is an apocalyptic number.

55561830 is an abundant number, since it is smaller than the sum of its proper divisors (78095514).

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

55561830 is a wasteful number, since it uses less digits than its factorization.

55561830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 55561830 is about 7453.9808156448. The cubic root of 55561830 is about 381.5857785355.

The spelling of 55561830 in words is "fifty-five million, five hundred sixty-one thousand, eight hundred thirty".