55015730 has 96 divisors (see below), whose sum is σ = 128537280. Its totient is φ = 16759680.

The previous prime is 55015729. The next prime is 55015759. The reversal of 55015730 is 3751055.

It is a self number, because there is not a number n which added to its sum of digits gives 55015730.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 317924 + ... + 318096.

It is an arithmetic number, because the mean of its divisors is an integer number (1338930).

Almost surely, 2^55015730 is an apocalyptic number.

55015730 is an abundant number, since it is smaller than the sum of its proper divisors (73521550).

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

55015730 is a wasteful number, since it uses less digits than its factorization.

55015730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 26.

The square root of 55015730 is about 7417.2589276632. The cubic root of 55015730 is about 380.3314974339.

Adding to 55015730 its reverse (3751055), we get a palindrome (58766785).

The spelling of 55015730 in words is "fifty-five million, fifteen thousand, seven hundred thirty".