78404772844 has 12 divisors (see below), whose sum is σ = 138209874264. Its totient is φ = 38916237344.

The previous prime is 78404772793. The next prime is 78404772847. The reversal of 78404772844 is 44827740487.

It is a super-2 number, since 2×78404772844² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78404772847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71536654 + ... + 71537749.

It is an arithmetic number, because the mean of its divisors is an integer number (11517489522).

Almost surely, 2^78404772844 is an apocalyptic number.

It is an amenable number.

78404772844 is a deficient number, since it is larger than the sum of its proper divisors (59805101420).

78404772844 is a wasteful number, since it uses less digits than its factorization.

78404772844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143074544 (or 143074542 counting only the distinct ones).

The product of its (nonzero) digits is 11239424, while the sum is 55.

The spelling of 78404772844 in words is "seventy-eight billion, four hundred four million, seven hundred seventy-two thousand, eight hundred forty-four".