55740640 has 48 divisors (see below), whose sum is σ = 132895728. Its totient is φ = 22091776.

The previous prime is 55740589. The next prime is 55740673. The reversal of 55740640 is 4604755.

It is a happy number.

It is a congruent number.

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, 16539 + ... + 19621.

It is an arithmetic number, because the mean of its divisors is an integer number (2768661).

Almost surely, 2^55740640 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 55740640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66447864).

55740640 is an abundant number, since it is smaller than the sum of its proper divisors (77155088).

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

55740640 is a wasteful number, since it uses less digits than its factorization.

55740640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3203 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 55740640 is about 7465.9654432632. The cubic root of 55740640 is about 381.9946820893.

The spelling of 55740640 in words is "fifty-five million, seven hundred forty thousand, six hundred forty".