55617640 has 32 divisors (see below), whose sum is σ = 134767080. Its totient is φ = 20535552.

The previous prime is 55617629. The next prime is 55617643. The reversal of 55617640 is 4671655.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23059204 + 32558436 = 4802^2 + 5706^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55617596 and 55617605.

It is not an unprimeable number, because it can be changed into a prime (55617643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52959 + ... + 53998.

Almost surely, 2^55617640 is an apocalyptic number.

It is an amenable number.

55617640 is an abundant number, since it is smaller than the sum of its proper divisors (79149440).

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

55617640 is a wasteful number, since it uses less digits than its factorization.

55617640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106981 (or 106977 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 55617640 is about 7457.7235132445. The cubic root of 55617640 is about 381.7134991656.

The spelling of 55617640 in words is "fifty-five million, six hundred seventeen thousand, six hundred forty".