55457388 has 108 divisors (see below), whose sum is σ = 166267920. Its totient is φ = 15266880.

The previous prime is 55457387. The next prime is 55457429. The reversal of 55457388 is 88375455.

It is not an unprimeable number, because it can be changed into a prime (55457387) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 242058 + ... + 242286.

Almost surely, 2^55457388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55457388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83133960).

55457388 is an abundant number, since it is smaller than the sum of its proper divisors (110810532).

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

55457388 is a wasteful number, since it uses less digits than its factorization.

55457388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 272 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The square root of 55457388 is about 7446.9717335303. The cubic root of 55457388 is about 381.3465340788.

The spelling of 55457388 in words is "fifty-five million, four hundred fifty-seven thousand, three hundred eighty-eight".