55002640 has 80 divisors (see below), whose sum is σ = 159454080. Its totient is φ = 17141760.

The previous prime is 55002631. The next prime is 55002677. The reversal of 55002640 is 4620055.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 1696 + ... + 10624.

It is an arithmetic number, because the mean of its divisors is an integer number (1993176).

Almost surely, 2^55002640 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 55002640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79727040).

55002640 is an abundant number, since it is smaller than the sum of its proper divisors (104451440).

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

55002640 is a wasteful number, since it uses less digits than its factorization.

55002640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960 (or 8954 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55002640 is about 7416.3764737235. The cubic root of 55002640 is about 380.3013307027.

Adding to 55002640 its reverse (4620055), we get a palindrome (59622695).

The spelling of 55002640 in words is "fifty-five million, two thousand, six hundred forty".