78315969 has 4 divisors (see below), whose sum is σ = 104421296. Its totient is φ = 52210644.

The previous prime is 78315917. The next prime is 78315977. The reversal of 78315969 is 96951387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78315969 - 2⁷ = 78315841 is a prime.

It is a super-2 number, since 2×78315969² = 12266782000817922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78315869) 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, 13052659 + ... + 13052664.

It is an arithmetic number, because the mean of its divisors is an integer number (26105324).

Almost surely, 2^78315969 is an apocalyptic number.

It is an amenable number.

78315969 is a deficient number, since it is larger than the sum of its proper divisors (26105327).

78315969 is a wasteful number, since it uses less digits than its factorization.

78315969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26105326.

The product of its digits is 408240, while the sum is 48.

The square root of 78315969 is about 8849.6310092568. The cubic root of 78315969 is about 427.8420257967.

The spelling of 78315969 in words is "seventy-eight million, three hundred fifteen thousand, nine hundred sixty-nine".