55605858 has 64 divisors (see below), whose sum is σ = 144709632. Its totient is φ = 13812480.

The previous prime is 55605839. The next prime is 55605859. The reversal of 55605858 is 85850655.

It is a super-2 number, since 2×55605858² = 6184022887832328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (55605859) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8010 + ... + 13242.

It is an arithmetic number, because the mean of its divisors is an integer number (2261088).

Almost surely, 2^55605858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55605858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72354816).

55605858 is an abundant number, since it is smaller than the sum of its proper divisors (89103774).

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

55605858 is a wasteful number, since it uses less digits than its factorization.

55605858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5279.

The product of its (nonzero) digits is 240000, while the sum is 42.

The square root of 55605858 is about 7456.9335520709. The cubic root of 55605858 is about 381.6865432930.

The spelling of 55605858 in words is "fifty-five million, six hundred five thousand, eight hundred fifty-eight".