308904136656 has 80 divisors (see below), whose sum is σ = 845398016064. Its totient is φ = 96858990592.

The previous prime is 308904136637. The next prime is 308904136657. The reversal of 308904136656 is 656631409803.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 308904136599 and 308904136608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308904136657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1430791 + ... + 1632473.

Almost surely, 2^308904136656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308904136656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (422699008032).

308904136656 is an abundant number, since it is smaller than the sum of its proper divisors (536493879408).

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

308904136656 is a wasteful number, since it uses less digits than its factorization.

308904136656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203588 (or 203582 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 51.

The spelling of 308904136656 in words is "three hundred eight billion, nine hundred four million, one hundred thirty-six thousand, six hundred fifty-six".