55457688 has 144 divisors (see below), whose sum is σ = 166478760. Its totient is φ = 15375360.

The previous prime is 55457687. The next prime is 55457693. The reversal of 55457688 is 88675455.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55457681) 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, 490720 + ... + 490832.

Almost surely, 2^55457688 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 55457688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83239380).

55457688 is an abundant number, since it is smaller than the sum of its proper divisors (111021072).

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

55457688 is a wasteful number, since it uses less digits than its factorization.

55457688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 142 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 48.

The square root of 55457688 is about 7446.9918759188. The cubic root of 55457688 is about 381.3472217164.

The spelling of 55457688 in words is "fifty-five million, four hundred fifty-seven thousand, six hundred eighty-eight".