55705890 has 32 divisors (see below), whose sum is σ = 135582336. Its totient is φ = 14645120.

The previous prime is 55705879. The next prime is 55705919. The reversal of 55705890 is 9850755.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10947 + ... + 15206.

It is an arithmetic number, because the mean of its divisors is an integer number (4236948).

Almost surely, 2^55705890 is an apocalyptic number.

55705890 is an abundant number, since it is smaller than the sum of its proper divisors (79876446).

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

55705890 is a wasteful number, since it uses less digits than its factorization.

55705890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26234.

The product of its (nonzero) digits is 63000, while the sum is 39.

The square root of 55705890 is about 7463.6378529508. The cubic root of 55705890 is about 381.9152841571.

The spelling of 55705890 in words is "fifty-five million, seven hundred five thousand, eight hundred ninety".