15549957028 has 6 divisors (see below), whose sum is σ = 27212424806. Its totient is φ = 7774978512.

The previous prime is 15549957019. The next prime is 15549957041. The reversal of 15549957028 is 82075994551.

It can be written as a sum of positive squares in only one way, i.e., 14933328804 + 616628224 = 122202^2 + 24832^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 15549957028.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1943744625 + ... + 1943744632.

Almost surely, 2^15549957028 is an apocalyptic number.

It is an amenable number.

15549957028 is a deficient number, since it is larger than the sum of its proper divisors (11662467778).

15549957028 is a wasteful number, since it uses less digits than its factorization.

15549957028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887489261 (or 3887489259 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 55.

The spelling of 15549957028 in words is "fifteen billion, five hundred forty-nine million, nine hundred fifty-seven thousand, twenty-eight".