78779995 has 24 divisors (see below), whose sum is σ = 112063824. Its totient is φ = 52992576.

The previous prime is 78779977. The next prime is 78780001. The reversal of 78779995 is 59997787.

It is not a de Polignac number, because 78779995 - 2¹¹ = 78777947 is a prime.

It is a super-2 number, since 2×78779995² = 12412575224400050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 9952 + ... + 16018.

It is an arithmetic number, because the mean of its divisors is an integer number (4669326).

Almost surely, 2^78779995 is an apocalyptic number.

78779995 is a deficient number, since it is larger than the sum of its proper divisors (33283829).

78779995 is a wasteful number, since it uses less digits than its factorization.

78779995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6139 (or 6132 counting only the distinct ones).

The product of its digits is 10001880, while the sum is 61.

The square root of 78779995 is about 8875.8095405433. The cubic root of 78779995 is about 428.6853574625.

The spelling of 78779995 in words is "seventy-eight million, seven hundred seventy-nine thousand, nine hundred ninety-five".