78229679 has 4 divisors (see below), whose sum is σ = 85341480. Its totient is φ = 71117880.

The previous prime is 78229673. The next prime is 78229687. The reversal of 78229679 is 97692287.

It is a happy number.

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 78229679 - 2⁸ = 78229423 is a prime.

It is a super-2 number, since 2×78229679² = 12239765352886082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78229673) 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, 3555884 + ... + 3555905.

It is an arithmetic number, because the mean of its divisors is an integer number (21335370).

Almost surely, 2^78229679 is an apocalyptic number.

78229679 is a deficient number, since it is larger than the sum of its proper divisors (7111801).

78229679 is a wasteful number, since it uses less digits than its factorization.

78229679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7111800.

The product of its digits is 762048, while the sum is 50.

The square root of 78229679 is about 8844.7543210651. The cubic root of 78229679 is about 427.6848332669.

The spelling of 78229679 in words is "seventy-eight million, two hundred twenty-nine thousand, six hundred seventy-nine".