77878758312 has 40 divisors (see below), whose sum is σ = 218132635050. Its totient is φ = 25959585888.

The previous prime is 77878758281. The next prime is 77878758367. The reversal of 77878758312 is 21385787877.

It can be written as a sum of positive squares in only one way, i.e., 75676708836 + 2202049476 = 275094^2 + 46926^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77878758312.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 60090987 + ... + 60092282.

Almost surely, 2^77878758312 is an apocalyptic number.

77878758312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77878758312 is an abundant number, since it is smaller than the sum of its proper divisors (140253876738).

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

77878758312 is a wasteful number, since it uses less digits than its factorization.

77878758312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120183287 (or 120183274 counting only the distinct ones).

The product of its digits is 36879360, while the sum is 63.

The spelling of 77878758312 in words is "seventy-seven billion, eight hundred seventy-eight million, seven hundred fifty-eight thousand, three hundred twelve".