78278325 has 24 divisors (see below), whose sum is σ = 129679200. Its totient is φ = 41664960.

The previous prime is 78278303. The next prime is 78278329. The reversal of 78278325 is 52387287.

It is not a de Polignac number, because 78278325 - 2⁵ = 78278293 is a prime.

It is a super-2 number, since 2×78278325² = 12254992329611250, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78278329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61546 + ... + 62804.

It is an arithmetic number, because the mean of its divisors is an integer number (5403300).

Almost surely, 2^78278325 is an apocalyptic number.

78278325 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78278325 is a deficient number, since it is larger than the sum of its proper divisors (51400875).

78278325 is a wasteful number, since it uses less digits than its factorization.

78278325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101 (or 2096 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 78278325 is about 8847.5038852775. The cubic root of 78278325 is about 427.7734647841.

The spelling of 78278325 in words is "seventy-eight million, two hundred seventy-eight thousand, three hundred twenty-five".