55310640 has 320 divisors, whose sum is σ = 221985792. Its totient is φ = 11059200.

The previous prime is 55310621. The next prime is 55310663. The reversal of 55310640 is 4601355.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 55310640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 757644 + ... + 757716.

Almost surely, 2^55310640 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 55310640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110992896).

55310640 is an abundant number, since it is smaller than the sum of its proper divisors (166675152).

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

55310640 is a wasteful number, since it uses less digits than its factorization.

55310640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 55310640 is about 7437.1123428384. The cubic root of 55310640 is about 381.0098715418.

Adding to 55310640 its reverse (4601355), we get a palindrome (59911995).

The spelling of 55310640 in words is "fifty-five million, three hundred ten thousand, six hundred forty".