55252638 has 64 divisors (see below), whose sum is σ = 141073920. Its totient is φ = 15702336.

The previous prime is 55252621. The next prime is 55252643. The reversal of 55252638 is 83625255.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118081 + ... + 118547.

It is an arithmetic number, because the mean of its divisors is an integer number (2204280).

Almost surely, 2^55252638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55252638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70536960).

55252638 is an abundant number, since it is smaller than the sum of its proper divisors (85821282).

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

55252638 is a wasteful number, since it uses less digits than its factorization.

55252638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 792 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 55252638 is about 7433.2118226242. The cubic root of 55252638 is about 380.8766418174.

The spelling of 55252638 in words is "fifty-five million, two hundred fifty-two thousand, six hundred thirty-eight".