78749043009 has 32 divisors (see below), whose sum is σ = 129245163264. Its totient is φ = 41532825600.

The previous prime is 78749043001. The next prime is 78749043013. The reversal of 78749043009 is 90034094787.

It is a happy number.

It is not a de Polignac number, because 78749043009 - 2³ = 78749043001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78749043001) 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, 3382609 + ... + 3405809.

It is an arithmetic number, because the mean of its divisors is an integer number (4038911352).

Almost surely, 2^78749043009 is an apocalyptic number.

It is an amenable number.

78749043009 is a deficient number, since it is larger than the sum of its proper divisors (50496120255).

78749043009 is a wasteful number, since it uses less digits than its factorization.

78749043009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35657.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 78749043009 in words is "seventy-eight billion, seven hundred forty-nine million, forty-three thousand, nine".