747779682816 has 200 divisors, whose sum is σ = 2308892115420. Its totient is φ = 240664338432.

The previous prime is 747779682779. The next prime is 747779682823. The reversal of 747779682816 is 618286977747.

747779682816 is a `hidden beast` number, since 7 + 477 + 79 + 6 + 8 + 2 + 81 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 652372828416 + 95406854400 = 807696^2 + 308880^2 .

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

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, 891810 + ... + 1513566.

Almost surely, 2^747779682816 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 747779682816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1154446057710).

747779682816 is an abundant number, since it is smaller than the sum of its proper divisors (1561112432604).

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

747779682816 is an equidigital number, since it uses as much as digits as its factorization.

747779682816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621816 (or 621791 counting only the distinct ones).

The product of its digits is 398297088, while the sum is 72.

The spelling of 747779682816 in words is "seven hundred forty-seven billion, seven hundred seventy-nine million, six hundred eighty-two thousand, eight hundred sixteen".