77651038280 has 32 divisors (see below), whose sum is σ = 174740052600. Its totient is φ = 31055932416.

The previous prime is 77651038253. The next prime is 77651038303. The reversal of 77651038280 is 8283015677.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19347140836 + 58303897444 = 139094^2 + 241462^2 .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 147824 + ... + 420896.

Almost surely, 2^77651038280 is an apocalyptic number.

It is an amenable number.

77651038280 is an abundant number, since it is smaller than the sum of its proper divisors (97089014320).

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

77651038280 is a wasteful number, since it uses less digits than its factorization.

77651038280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280193 (or 280189 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 77651038280 in words is "seventy-seven billion, six hundred fifty-one million, thirty-eight thousand, two hundred eighty".