7878825 has 54 divisors (see below), whose sum is σ = 15047214. Its totient is φ = 3939840.

The previous prime is 7878823. The next prime is 7878841. The reversal of 7878825 is 5288787.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 393129 + 7485696 = 627^2 + 2736^2 .

It is not a de Polignac number, because 7878825 - 2¹ = 7878823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (7878823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 81177 + ... + 81273.

Almost surely, 2^7878825 is an apocalyptic number.

7878825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7878825 is a deficient number, since it is larger than the sum of its proper divisors (7168389).

7878825 is a wasteful number, since it uses less digits than its factorization.

7878825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 124 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 7878825 is about 2806.9244735119. The cubic root of 7878825 is about 198.9850665965.

The spelling of 7878825 in words is "seven million, eight hundred seventy-eight thousand, eight hundred twenty-five".