55000040 has 32 divisors (see below), whose sum is σ = 125784360. Its totient is φ = 21638400.

The previous prime is 55000031. The next prime is 55000069. The reversal of 55000040 is 4000055.

It can be written as a sum of positive squares in 4 ways, for example, as 37039396 + 17960644 = 6086^2 + 4238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 54999979 and 55000024.

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, 8831 + ... + 13710.

Almost surely, 2^55000040 is an apocalyptic number.

It is an amenable number.

55000040 is an abundant number, since it is smaller than the sum of its proper divisors (70784320).

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

55000040 is a wasteful number, since it uses less digits than its factorization.

55000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22613 (or 22609 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 55000040 is about 7416.2011838946. The cubic root of 55000040 is about 380.2953382689.

Adding to 55000040 its reverse (4000055), we get a palindrome (59000095).

The spelling of 55000040 in words is "fifty-five million, forty", and thus it is an aban number and an uban number.