791987778 has 24 divisors (see below), whose sum is σ = 1718324400. Its totient is φ = 263634264.

The previous prime is 791987759. The next prime is 791987837. The reversal of 791987778 is 877789197.

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 11 ways as a sum of consecutive naturals, for example, 16468 + ... + 43071.

It is an arithmetic number, because the mean of its divisors is an integer number (71596850).

Almost surely, 2^791987778 is an apocalyptic number.

791987778 is an abundant number, since it is smaller than the sum of its proper divisors (926336622).

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

791987778 is a wasteful number, since it uses less digits than its factorization.

791987778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60286 (or 60283 counting only the distinct ones).

The product of its digits is 12446784, while the sum is 63.

The square root of 791987778 is about 28142.2774131732. The cubic root of 791987778 is about 925.2082425725.

The spelling of 791987778 in words is "seven hundred ninety-one million, nine hundred eighty-seven thousand, seven hundred seventy-eight".