55534640 has 120 divisors (see below), whose sum is σ = 155382912. Its totient is φ = 18385920.

The previous prime is 55534621. The next prime is 55534643. The reversal of 55534640 is 4643555.

It is a junction number, because it is equal to n+sod(n) for n = 55534597 and 55534606.

It is not an unprimeable number, because it can be changed into a prime (55534643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 121292 + ... + 121748.

Almost surely, 2^55534640 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 55534640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77691456).

55534640 is an abundant number, since it is smaller than the sum of its proper divisors (99848272).

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

55534640 is a wasteful number, since it uses less digits than its factorization.

55534640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 55534640 is about 7452.1567347983. The cubic root of 55534640 is about 381.5235235053.

The spelling of 55534640 in words is "fifty-five million, five hundred thirty-four thousand, six hundred forty".