77994299792 has 20 divisors (see below), whose sum is σ = 151151402700. Its totient is φ = 38987486208.

The previous prime is 77994299791. The next prime is 77994299807. The reversal of 77994299792 is 29799249977.

It can be written as a sum of positive squares in 2 ways, for example, as 51322183936 + 26672115856 = 226544^2 + 163316^2 .

It is a super-2 number, since 2×77994299792² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77994299791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537173 + ... + 666740.

It is an arithmetic number, because the mean of its divisors is an integer number (7557570135).

Almost surely, 2^77994299792 is an apocalyptic number.

It is an amenable number.

77994299792 is a deficient number, since it is larger than the sum of its proper divisors (73157102908).

77994299792 is a wasteful number, since it uses less digits than its factorization.

77994299792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207970 (or 1207964 counting only the distinct ones).

The product of its digits is 324060912, while the sum is 74.

The spelling of 77994299792 in words is "seventy-seven billion, nine hundred ninety-four million, two hundred ninety-nine thousand, seven hundred ninety-two".