55638366 has 64 divisors (see below), whose sum is σ = 132612096. Its totient is φ = 15228000.

The previous prime is 55638347. The next prime is 55638367. The reversal of 55638366 is 66383655.

It is a super-2 number, since 2×55638366² = 6191255542299912, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55638367) 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, 196461 + ... + 196743.

It is an arithmetic number, because the mean of its divisors is an integer number (2072064).

Almost surely, 2^55638366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55638366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66306048).

55638366 is an abundant number, since it is smaller than the sum of its proper divisors (76973730).

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

55638366 is a wasteful number, since it uses less digits than its factorization.

55638366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477.

The product of its digits is 388800, while the sum is 42.

The square root of 55638366 is about 7459.1129499425. The cubic root of 55638366 is about 381.7609086533.

The spelling of 55638366 in words is "fifty-five million, six hundred thirty-eight thousand, three hundred sixty-six".