28661268956 has 12 divisors (see below), whose sum is σ = 50249936520. Its totient is φ = 14304144240.

The previous prime is 28661268943. The next prime is 28661268973. The reversal of 28661268956 is 65986216682.

It is a junction number, because it is equal to n+sod(n) for n = 28661268895 and 28661268904.

It is a congruent number.

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, 6620126 + ... + 6624453.

It is an arithmetic number, because the mean of its divisors is an integer number (4187494710).

Almost surely, 2^28661268956 is an apocalyptic number.

It is an amenable number.

28661268956 is a deficient number, since it is larger than the sum of its proper divisors (21588667564).

28661268956 is a wasteful number, since it uses less digits than its factorization.

28661268956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13245124 (or 13245122 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 59.

The spelling of 28661268956 in words is "twenty-eight billion, six hundred sixty-one million, two hundred sixty-eight thousand, nine hundred fifty-six".