78720824293 has 4 divisors (see below), whose sum is σ = 78725982400. Its totient is φ = 78715666188.

The previous prime is 78720824279. The next prime is 78720824297. The reversal of 78720824293 is 39242802787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39242802787 = 19 ⋅2065410673.

It is a cyclic number.

It is not a de Polignac number, because 78720824293 - 2²¹ = 78718727141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78720824293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78720824297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2556093 + ... + 2586706.

It is an arithmetic number, because the mean of its divisors is an integer number (19681495600).

Almost surely, 2^78720824293 is an apocalyptic number.

It is an amenable number.

78720824293 is a deficient number, since it is larger than the sum of its proper divisors (5158107).

78720824293 is a wasteful number, since it uses less digits than its factorization.

78720824293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5158106.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The spelling of 78720824293 in words is "seventy-eight billion, seven hundred twenty million, eight hundred twenty-four thousand, two hundred ninety-three".