77312808478 has 8 divisors (see below), whose sum is σ = 115975785240. Its totient is φ = 38654213400.

The previous prime is 77312808347. The next prime is 77312808479. The reversal of 77312808478 is 87480821377.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77312808479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050948 + ... + 1122103.

It is an arithmetic number, because the mean of its divisors is an integer number (14496973155).

Almost surely, 2^77312808478 is an apocalyptic number.

77312808478 is a deficient number, since it is larger than the sum of its proper divisors (38662976762).

77312808478 is a wasteful number, since it uses less digits than its factorization.

77312808478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190842.

The product of its (nonzero) digits is 4214784, while the sum is 55.

The spelling of 77312808478 in words is "seventy-seven billion, three hundred twelve million, eight hundred eight thousand, four hundred seventy-eight".