55440040 has 32 divisors (see below), whose sum is σ = 125248680. Its totient is φ = 22085632.

The previous prime is 55440037. The next prime is 55440071. The reversal of 55440040 is 4004455.

It can be written as a sum of positive squares in 4 ways, for example, as 54199044 + 1240996 = 7362^2 + 1114^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55439993 and 55440020.

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, 7584 + ... + 12976.

Almost surely, 2^55440040 is an apocalyptic number.

It is an amenable number.

55440040 is an abundant number, since it is smaller than the sum of its proper divisors (69808640).

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

55440040 is a wasteful number, since it uses less digits than its factorization.

55440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5661 (or 5657 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 55440040 is about 7445.8068736706. The cubic root of 55440040 is about 381.3067660704.

Adding to 55440040 its reverse (4004455), we get a palindrome (59444495).

The spelling of 55440040 in words is "fifty-five million, four hundred forty thousand, forty".