78967779 has 16 divisors (see below), whose sum is σ = 115029504. Its totient is φ = 47789600.

The previous prime is 78967769. The next prime is 78967789. The reversal of 78967779 is 97776987.

It is an interprime number because it is at equal distance from previous prime (78967769) and next prime (78967789).

It is a cyclic number.

It is not a de Polignac number, because 78967779 - 2²⁰ = 77919203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78967729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29782 + ... + 32324.

It is an arithmetic number, because the mean of its divisors is an integer number (7189344).

Almost surely, 2^78967779 is an apocalyptic number.

78967779 is a deficient number, since it is larger than the sum of its proper divisors (36061725).

78967779 is a wasteful number, since it uses less digits than its factorization.

78967779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498.

The product of its digits is 9335088, while the sum is 60.

The square root of 78967779 is about 8886.3816595958. The cubic root of 78967779 is about 429.0256992554.

The spelling of 78967779 in words is "seventy-eight million, nine hundred sixty-seven thousand, seven hundred seventy-nine".