778796997 has 32 divisors (see below), whose sum is σ = 1184495616. Its totient is φ = 450542400.

The previous prime is 778796989. The next prime is 778797011. The reversal of 778796997 is 799697877.

It is not a de Polignac number, because 778796997 - 2³ = 778796989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778796957) 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, 563247 + ... + 564627.

It is an arithmetic number, because the mean of its divisors is an integer number (37015488).

Almost surely, 2^778796997 is an apocalyptic number.

It is an amenable number.

778796997 is a deficient number, since it is larger than the sum of its proper divisors (405698619).

778796997 is a wasteful number, since it uses less digits than its factorization.

778796997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161.

The product of its digits is 84015792, while the sum is 69.

The square root of 778796997 is about 27906.9345683112. The cubic root of 778796997 is about 920.0429237219.

The spelling of 778796997 in words is "seven hundred seventy-eight million, seven hundred ninety-six thousand, nine hundred ninety-seven".