78278875 has 16 divisors (see below), whose sum is σ = 100848384. Its totient is φ = 60600000.

The previous prime is 78278869. The next prime is 78278887. The reversal of 78278875 is 57887287.

It is a happy number.

It is not a de Polignac number, because 78278875 - 2⁷ = 78278747 is a prime.

It is a super-2 number, since 2×78278875² = 12255164542531250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6226 + ... + 13975.

It is an arithmetic number, because the mean of its divisors is an integer number (6303024).

Almost surely, 2^78278875 is an apocalyptic number.

78278875 is a deficient number, since it is larger than the sum of its proper divisors (22569509).

78278875 is a wasteful number, since it uses less digits than its factorization.

78278875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20247 (or 20237 counting only the distinct ones).

The product of its digits is 1756160, while the sum is 52.

The square root of 78278875 is about 8847.5349674358. The cubic root of 78278875 is about 427.7744666573.

The spelling of 78278875 in words is "seventy-eight million, two hundred seventy-eight thousand, eight hundred seventy-five".