55646840 has 32 divisors (see below), whose sum is σ = 128262960. Its totient is φ = 21715200.

The previous prime is 55646837. The next prime is 55646861. The reversal of 55646840 is 4864655.

It is a junction number, because it is equal to n+sod(n) for n = 55646794 and 55646803.

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, 15326 + ... + 18605.

Almost surely, 2^55646840 is an apocalyptic number.

It is an amenable number.

55646840 is an abundant number, since it is smaller than the sum of its proper divisors (72616120).

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

55646840 is a wasteful number, since it uses less digits than its factorization.

55646840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33983 (or 33979 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The square root of 55646840 is about 7459.6809583252. The cubic root of 55646840 is about 381.7802890314.

The spelling of 55646840 in words is "fifty-five million, six hundred forty-six thousand, eight hundred forty".