28107209644 has 6 divisors (see below), whose sum is σ = 49187616884. Its totient is φ = 14053604820.

The previous prime is 28107209623. The next prime is 28107209653. The reversal of 28107209644 is 44690270182.

It is a self number, because there is not a number n which added to its sum of digits gives 28107209644.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3513401202 + ... + 3513401209.

Almost surely, 2^28107209644 is an apocalyptic number.

It is an amenable number.

28107209644 is a deficient number, since it is larger than the sum of its proper divisors (21080407240).

28107209644 is a wasteful number, since it uses less digits than its factorization.

28107209644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7026802415 (or 7026802413 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 28107209644 in words is "twenty-eight billion, one hundred seven million, two hundred nine thousand, six hundred forty-four".