78749597309 has 8 divisors (see below), whose sum is σ = 80479277568. Its totient is φ = 77022173680.

The previous prime is 78749597249. The next prime is 78749597317. The reversal of 78749597309 is 90379594787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78749597309 - 2⁸ = 78749597053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78749597809) 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, 493502 + ... + 633279.

It is an arithmetic number, because the mean of its divisors is an integer number (10059909696).

Almost surely, 2^78749597309 is an apocalyptic number.

It is an amenable number.

78749597309 is a deficient number, since it is larger than the sum of its proper divisors (1729680259).

78749597309 is a wasteful number, since it uses less digits than its factorization.

78749597309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128315.

The product of its (nonzero) digits is 120022560, while the sum is 68.

The spelling of 78749597309 in words is "seventy-eight billion, seven hundred forty-nine million, five hundred ninety-seven thousand, three hundred nine".