77783278328 has 32 divisors (see below), whose sum is σ = 166752056160. Its totient is φ = 33320970240.

The previous prime is 77783278283. The next prime is 77783278333. The reversal of 77783278328 is 82387238777.

It is a super-2 number, since 2×77783278328² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178253 + ... + 432828.

It is an arithmetic number, because the mean of its divisors is an integer number (5211001755).

Almost surely, 2^77783278328 is an apocalyptic number.

It is an amenable number.

77783278328 is an abundant number, since it is smaller than the sum of its proper divisors (88968777832).

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

77783278328 is a wasteful number, since it uses less digits than its factorization.

77783278328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613367 (or 613363 counting only the distinct ones).

The product of its digits is 44255232, while the sum is 62.

The spelling of 77783278328 in words is "seventy-seven billion, seven hundred eighty-three million, two hundred seventy-eight thousand, three hundred twenty-eight".