78679829 has 4 divisors (see below), whose sum is σ = 81217920. Its totient is φ = 76141740.

The previous prime is 78679819. The next prime is 78679837. The reversal of 78679829 is 92897687.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78679829 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78679819) 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, 1268999 + ... + 1269060.

It is an arithmetic number, because the mean of its divisors is an integer number (20304480).

Almost surely, 2^78679829 is an apocalyptic number.

It is an amenable number.

78679829 is a deficient number, since it is larger than the sum of its proper divisors (2538091).

78679829 is a wasteful number, since it uses less digits than its factorization.

78679829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538090.

The product of its digits is 3048192, while the sum is 56.

The square root of 78679829 is about 8870.1651055660. The cubic root of 78679829 is about 428.5035942743.

The spelling of 78679829 in words is "seventy-eight million, six hundred seventy-nine thousand, eight hundred twenty-nine".