55659440 has 20 divisors (see below), whose sum is σ = 129408384. Its totient is φ = 22263744.

The previous prime is 55659437. The next prime is 55659521. The reversal of 55659440 is 4495655.

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

It is a super-2 number, since 2×55659440² = 6195946522227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55659394 and 55659403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347792 + ... + 347951.

Almost surely, 2^55659440 is an apocalyptic number.

It is an amenable number.

55659440 is an abundant number, since it is smaller than the sum of its proper divisors (73748944).

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

55659440 is a wasteful number, since it uses less digits than its factorization.

55659440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695756 (or 695750 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 55659440 is about 7460.5254506636. The cubic root of 55659440 is about 381.8091020998.

The spelling of 55659440 in words is "fifty-five million, six hundred fifty-nine thousand, four hundred forty".