78040373778 has 64 divisors (see below), whose sum is σ = 173908723200. Its totient is φ = 25940736000.

The previous prime is 78040373777. The next prime is 78040373783. The reversal of 78040373778 is 87737304087.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (78040373777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46757928 + ... + 46759596.

It is an arithmetic number, because the mean of its divisors is an integer number (2717323800).

Almost surely, 2^78040373778 is an apocalyptic number.

78040373778 is an abundant number, since it is smaller than the sum of its proper divisors (95868349422).

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

78040373778 is a wasteful number, since it uses less digits than its factorization.

78040373778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3578 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 54.

The spelling of 78040373778 in words is "seventy-eight billion, forty million, three hundred seventy-three thousand, seven hundred seventy-eight".