78387375 has 64 divisors (see below), whose sum is σ = 147124224. Its totient is φ = 36720000.

The previous prime is 78387359. The next prime is 78387383. The reversal of 78387375 is 57378387.

It is not a de Polignac number, because 78387375 - 2⁴ = 78387359 is a prime.

It is a super-2 number, since 2×78387375² = 12289161118781250, which contains 22 as substring.

It is a congruent 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 63 ways as a sum of consecutive naturals, for example, 127569 + ... + 128181.

It is an arithmetic number, because the mean of its divisors is an integer number (2298816).

Almost surely, 2^78387375 is an apocalyptic number.

78387375 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78387375 is a deficient number, since it is larger than the sum of its proper divisors (68736849).

78387375 is a wasteful number, since it uses less digits than its factorization.

78387375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673 (or 663 counting only the distinct ones).

The product of its digits is 987840, while the sum is 48.

The square root of 78387375 is about 8853.6644955634. The cubic root of 78387375 is about 427.9720171969.

The spelling of 78387375 in words is "seventy-eight million, three hundred eighty-seven thousand, three hundred seventy-five".