55571648 has 56 divisors (see below), whose sum is σ = 121218960. Its totient is φ = 25067520.

The previous prime is 55571639. The next prime is 55571683. The reversal of 55571648 is 84617555.

It is a super-2 number, since 2×55571648² = 6176416122871808, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135668 + ... + 136076.

Almost surely, 2^55571648 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 55571648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60609480).

55571648 is an abundant number, since it is smaller than the sum of its proper divisors (65647312).

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

55571648 is a wasteful number, since it uses less digits than its factorization.

55571648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 615 counting only the distinct ones).

The product of its digits is 168000, while the sum is 41.

The square root of 55571648 is about 7454.6393608276. The cubic root of 55571648 is about 381.6082531284.

The spelling of 55571648 in words is "fifty-five million, five hundred seventy-one thousand, six hundred forty-eight".