55472640 has 160 divisors (see below), whose sum is σ = 183845376. Its totient is φ = 14254080.

The previous prime is 55472633. The next prime is 55472663. The reversal of 55472640 is 4627455.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237964 + ... + 238196.

Almost surely, 2^55472640 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 55472640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91922688).

55472640 is an abundant number, since it is smaller than the sum of its proper divisors (128372736).

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

55472640 is a wasteful number, since it uses less digits than its factorization.

55472640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 55472640 is about 7447.9957035433. The cubic root of 55472640 is about 381.3814904325.

The spelling of 55472640 in words is "fifty-five million, four hundred seventy-two thousand, six hundred forty".