78369215 has 8 divisors (see below), whose sum is σ = 94329168. Its totient is φ = 62504640.

The previous prime is 78369149. The next prime is 78369227. The reversal of 78369215 is 51296387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78369215 - 2⁸ = 78368959 is a prime.

It is a super-2 number, since 2×78369215² = 12283467719432450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22022 + ... + 25331.

It is an arithmetic number, because the mean of its divisors is an integer number (11791146).

Almost surely, 2^78369215 is an apocalyptic number.

78369215 is a deficient number, since it is larger than the sum of its proper divisors (15959953).

78369215 is a wasteful number, since it uses less digits than its factorization.

78369215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47689.

The product of its digits is 90720, while the sum is 41.

The square root of 78369215 is about 8852.6388721104. The cubic root of 78369215 is about 427.9389652244.

The spelling of 78369215 in words is "seventy-eight million, three hundred sixty-nine thousand, two hundred fifteen".