79786819 has 4 divisors (see below), whose sum is σ = 91184944. Its totient is φ = 68388696.

The previous prime is 79786813. The next prime is 79786823. The reversal of 79786819 is 91868797.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79786819 - 2⁷ = 79786691 is a prime.

It is a super-2 number, since 2×79786819² = 12731872972277522, which contains 22 as substring.

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 79786819.

It is not an unprimeable number, because it can be changed into a prime (79786813) 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, 5699052 + ... + 5699065.

It is an arithmetic number, because the mean of its divisors is an integer number (22796236).

Almost surely, 2^79786819 is an apocalyptic number.

79786819 is a deficient number, since it is larger than the sum of its proper divisors (11398125).

79786819 is a wasteful number, since it uses less digits than its factorization.

79786819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11398124.

The product of its digits is 1524096, while the sum is 55.

The square root of 79786819 is about 8932.3467801021. The cubic root of 79786819 is about 430.5038604163.

It can be divided in two parts, 797 and 86819, that added together give a square (87616 = 296²).

The spelling of 79786819 in words is "seventy-nine million, seven hundred eighty-six thousand, eight hundred nineteen".