78040778 has 16 divisors (see below), whose sum is σ = 124649280. Its totient is φ = 36517056.

The previous prime is 78040759. The next prime is 78040783. The reversal of 78040778 is 87704087.

It is a happy number.

It is a Curzon 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, 326 + ... + 12497.

It is an arithmetic number, because the mean of its divisors is an integer number (7790580).

Almost surely, 2^78040778 is an apocalyptic number.

78040778 is a deficient number, since it is larger than the sum of its proper divisors (46608502).

78040778 is a wasteful number, since it uses less digits than its factorization.

78040778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13021.

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 78040778 is about 8834.0691643206. The cubic root of 78040778 is about 427.3403126665.

The spelling of 78040778 in words is "seventy-eight million, forty thousand, seven hundred seventy-eight".