78682993 has 4 divisors (see below), whose sum is σ = 78705648. Its totient is φ = 78660340.

The previous prime is 78682969. The next prime is 78682997. The reversal of 78682993 is 39928687.

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: 39928687 = 3413 ⋅11699.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78682993 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 78682993.

It is not an unprimeable number, because it can be changed into a prime (78682997) 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, 4903 + ... + 13468.

It is an arithmetic number, because the mean of its divisors is an integer number (19676412).

Almost surely, 2^78682993 is an apocalyptic number.

It is an amenable number.

78682993 is a deficient number, since it is larger than the sum of its proper divisors (22655).

78682993 is a wasteful number, since it uses less digits than its factorization.

78682993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22654.

The product of its digits is 1306368, while the sum is 52.

The square root of 78682993 is about 8870.3434544554. The cubic root of 78682993 is about 428.5093380896.

The spelling of 78682993 in words is "seventy-eight million, six hundred eighty-two thousand, nine hundred ninety-three".