778042992 has 40 divisors (see below), whose sum is σ = 2038262400. Its totient is φ = 255693760.

The previous prime is 778042987. The next prime is 778042997. The reversal of 778042992 is 299240877.

It is an interprime number because it is at equal distance from previous prime (778042987) and next prime (778042997).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778042997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110742 + ... + 117557.

It is an arithmetic number, because the mean of its divisors is an integer number (50956560).

Almost surely, 2^778042992 is an apocalyptic number.

It is an amenable number.

778042992 is an abundant number, since it is smaller than the sum of its proper divisors (1260219408).

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

778042992 is a wasteful number, since it uses less digits than its factorization.

778042992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228381 (or 228375 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 778042992 is about 27893.4220202542. The cubic root of 778042992 is about 919.7459096667.

The spelling of 778042992 in words is "seven hundred seventy-eight million, forty-two thousand, nine hundred ninety-two".