55847640 has 64 divisors (see below), whose sum is σ = 168161760. Its totient is φ = 14837760.

The previous prime is 55847633. The next prime is 55847641. The reversal of 55847640 is 4674855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55847641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39750 + ... + 41130.

Almost surely, 2^55847640 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 55847640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84080880).

55847640 is an abundant number, since it is smaller than the sum of its proper divisors (112314120).

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

55847640 is a wasteful number, since it uses less digits than its factorization.

55847640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732 (or 1728 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 55847640 is about 7473.1278592033. The cubic root of 55847640 is about 382.2389521301.

The spelling of 55847640 in words is "fifty-five million, eight hundred forty-seven thousand, six hundred forty".