28788297688 has 8 divisors (see below), whose sum is σ = 53978058180. Its totient is φ = 14394148840.

The previous prime is 28788297661. The next prime is 28788297689. The reversal of 28788297688 is 88679288782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28788297688² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28788297688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788297689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1799268598 + ... + 1799268613.

Almost surely, 2^28788297688 is an apocalyptic number.

It is an amenable number.

28788297688 is a deficient number, since it is larger than the sum of its proper divisors (25189760492).

28788297688 is a wasteful number, since it uses less digits than its factorization.

28788297688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3598537217 (or 3598537213 counting only the distinct ones).

The product of its digits is 346816512, while the sum is 73.

The spelling of 28788297688 in words is "twenty-eight billion, seven hundred eighty-eight million, two hundred ninety-seven thousand, six hundred eighty-eight".