78906825 has 72 divisors (see below), whose sum is σ = 151205600. Its totient is φ = 40340160.

The previous prime is 78906823. The next prime is 78906847. The reversal of 78906825 is 52860987.

It is not a de Polignac number, because 78906825 - 2¹ = 78906823 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 (78906823) 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 71 ways as a sum of consecutive naturals, for example, 567606 + ... + 567744.

Almost surely, 2^78906825 is an apocalyptic number.

78906825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78906825 is a deficient number, since it is larger than the sum of its proper divisors (72298775).

78906825 is a wasteful number, since it uses less digits than its factorization.

78906825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 78906825 is about 8882.9513676480. The cubic root of 78906825 is about 428.9152847540.

The spelling of 78906825 in words is "seventy-eight million, nine hundred six thousand, eight hundred twenty-five".