55125640 has 16 divisors (see below), whose sum is σ = 124032780. Its totient is φ = 22050240.

The previous prime is 55125619. The next prime is 55125659. The reversal of 55125640 is 4652155.

It can be written as a sum of positive squares in 2 ways, for example, as 53553124 + 1572516 = 7318^2 + 1254^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55125599 and 55125608.

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, 689031 + ... + 689110.

Almost surely, 2^55125640 is an apocalyptic number.

It is an amenable number.

55125640 is an abundant number, since it is smaller than the sum of its proper divisors (68907140).

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

55125640 is a wasteful number, since it uses less digits than its factorization.

55125640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378152 (or 1378148 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 55125640 is about 7424.6643021756. The cubic root of 55125640 is about 380.5846033992.

Adding to 55125640 its reverse (4652155), we get a palindrome (59777795).

The spelling of 55125640 in words is "fifty-five million, one hundred twenty-five thousand, six hundred forty".