78778465674 has 32 divisors (see below), whose sum is σ = 158197389120. Its totient is φ = 26152929792.

The previous prime is 78778465669. The next prime is 78778465687. The reversal of 78778465674 is 47656487787.

It is a junction number, because it is equal to n+sod(n) for n = 78778465599 and 78778465608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1733389 + ... + 1778255.

It is an arithmetic number, because the mean of its divisors is an integer number (4943668410).

Almost surely, 2^78778465674 is an apocalyptic number.

78778465674 is an abundant number, since it is smaller than the sum of its proper divisors (79418923446).

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

78778465674 is a wasteful number, since it uses less digits than its factorization.

78778465674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46054.

The product of its digits is 442552320, while the sum is 69.

The spelling of 78778465674 in words is "seventy-eight billion, seven hundred seventy-eight million, four hundred sixty-five thousand, six hundred seventy-four".