78864225 has 48 divisors (see below), whose sum is σ = 143711040. Its totient is φ = 37843200.

The previous prime is 78864223. The next prime is 78864229. The reversal of 78864225 is 52246887.

It is a happy number.

It is not a de Polignac number, because 78864225 - 2¹ = 78864223 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78864221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89487 + ... + 90363.

It is an arithmetic number, because the mean of its divisors is an integer number (2993980).

Almost surely, 2^78864225 is an apocalyptic number.

78864225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78864225 is a deficient number, since it is larger than the sum of its proper divisors (64846815).

78864225 is a wasteful number, since it uses less digits than its factorization.

78864225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010 (or 1005 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 78864225 is about 8880.5531922285. The cubic root of 78864225 is about 428.8380836573.

The spelling of 78864225 in words is "seventy-eight million, eight hundred sixty-four thousand, two hundred twenty-five".