56550640 has 20 divisors (see below), whose sum is σ = 131480424. Its totient is φ = 22620224.

The previous prime is 56550601. The next prime is 56550643. The reversal of 56550640 is 4605565.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56550643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353362 + ... + 353521.

Almost surely, 2^56550640 is an apocalyptic number.

It is an amenable number.

56550640 is an abundant number, since it is smaller than the sum of its proper divisors (74929784).

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

56550640 is a wasteful number, since it uses less digits than its factorization.

56550640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706896 (or 706890 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 56550640 is about 7520.0159574299. The cubic root of 56550640 is about 383.8361207543.

The spelling of 56550640 in words is "fifty-six million, five hundred fifty thousand, six hundred forty".