2788808905656 has 80 divisors (see below), whose sum is σ = 7815197827800. Its totient is φ = 929132807616.

The previous prime is 2788808905643. The next prime is 2788808905669. The reversal of 2788808905656 is 6565098088872.

It is an interprime number because it is at equal distance from previous prime (2788808905643) and next prime (2788808905669).

It is a super-2 number, since 2×2788808905656² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 195046 + ... + 2369738.

Almost surely, 2^{2788808905656} is an apocalyptic number.

It is an amenable number.

2788808905656 is an abundant number, since it is smaller than the sum of its proper divisors (5026388922144).

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

2788808905656 is a wasteful number, since it uses less digits than its factorization.

2788808905656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176690 (or 2176677 counting only the distinct ones).

The product of its (nonzero) digits is 464486400, while the sum is 72.

The spelling of 2788808905656 in words is "two trillion, seven hundred eighty-eight billion, eight hundred eight million, nine hundred five thousand, six hundred fifty-six".