55540780 has 12 divisors (see below), whose sum is σ = 116635680. Its totient is φ = 22216304.

The previous prime is 55540769. The next prime is 55540799. The reversal of 55540780 is 8704555.

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, 1388500 + ... + 1388539.

It is an arithmetic number, because the mean of its divisors is an integer number (9719640).

Almost surely, 2^55540780 is an apocalyptic number.

It is an amenable number.

55540780 is an abundant number, since it is smaller than the sum of its proper divisors (61094900).

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

55540780 is a wasteful number, since it uses less digits than its factorization.

55540780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777048 (or 2777046 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 55540780 is about 7452.5686846885. The cubic root of 55540780 is about 381.5375836073.

The spelling of 55540780 in words is "fifty-five million, five hundred forty thousand, seven hundred eighty".