76780021828 has 6 divisors (see below), whose sum is σ = 134365038206. Its totient is φ = 38390010912.

The previous prime is 76780021823. The next prime is 76780021867. The reversal of 76780021828 is 82812008767.

It can be written as a sum of positive squares in only one way, i.e., 75739443264 + 1040578564 = 275208^2 + 32258^2 .

It is not an unprimeable number, because it can be changed into a prime (76780021823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9597502725 + ... + 9597502732.

Almost surely, 2^76780021828 is an apocalyptic number.

It is an amenable number.

76780021828 is a deficient number, since it is larger than the sum of its proper divisors (57585016378).

76780021828 is a wasteful number, since it uses less digits than its factorization.

76780021828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19195005461 (or 19195005459 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 49.

The spelling of 76780021828 in words is "seventy-six billion, seven hundred eighty million, twenty-one thousand, eight hundred twenty-eight".