55909810 has 16 divisors (see below), whose sum is σ = 109786752. Its totient is φ = 20330800.

The previous prime is 55909793. The next prime is 55909811. The reversal of 55909810 is 1890955.

It is a super-2 number, since 2×55909810² = 6251813708472200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55909810.

It is not an unprimeable number, because it can be changed into a prime (55909811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254026 + ... + 254245.

It is an arithmetic number, because the mean of its divisors is an integer number (6861672).

Almost surely, 2^55909810 is an apocalyptic number.

55909810 is a deficient number, since it is larger than the sum of its proper divisors (53876942).

55909810 is a wasteful number, since it uses less digits than its factorization.

55909810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508289.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 55909810 is about 7477.2862724387. The cubic root of 55909810 is about 382.3807365940.

It can be divided in two parts, 5590 and 9810, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 55909810 in words is "fifty-five million, nine hundred nine thousand, eight hundred ten".