79778619 has 6 divisors (see below), whose sum is σ = 115235796. Its totient is φ = 53185740.

The previous prime is 79778609. The next prime is 79778639. The reversal of 79778619 is 91687797.

It is not a de Polignac number, because 79778619 - 2⁹ = 79778107 is a prime.

It is a super-2 number, since 2×79778619² = 12729256099094322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79778609) 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 5 ways as a sum of consecutive naturals, for example, 4432137 + ... + 4432154.

It is an arithmetic number, because the mean of its divisors is an integer number (19205966).

Almost surely, 2^79778619 is an apocalyptic number.

79778619 is a deficient number, since it is larger than the sum of its proper divisors (35457177).

79778619 is a wasteful number, since it uses less digits than its factorization.

79778619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8864297 (or 8864294 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 79778619 is about 8931.8877623938. The cubic root of 79778619 is about 430.4891117287.

The spelling of 79778619 in words is "seventy-nine million, seven hundred seventy-eight thousand, six hundred nineteen".