78387393 has 16 divisors (see below), whose sum is σ = 119669760. Its totient is φ = 44709456.

The previous prime is 78387389. The next prime is 78387457. The reversal of 78387393 is 39378387.

It is not a de Polignac number, because 78387393 - 2² = 78387389 is a prime.

It is a super-2 number, since 2×78387393² = 12289166762672898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78387383) 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, 9148 + ... + 15506.

It is an arithmetic number, because the mean of its divisors is an integer number (7479360).

Almost surely, 2^78387393 is an apocalyptic number.

It is an amenable number.

78387393 is a deficient number, since it is larger than the sum of its proper divisors (41282367).

78387393 is a wasteful number, since it uses less digits than its factorization.

78387393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956.

The product of its digits is 762048, while the sum is 48.

The square root of 78387393 is about 8853.6655120916. The cubic root of 78387393 is about 427.9720499552.

The spelling of 78387393 in words is "seventy-eight million, three hundred eighty-seven thousand, three hundred ninety-three".