78829425 has 72 divisors (see below), whose sum is σ = 153813816. Its totient is φ = 38430720.

The previous prime is 78829417. The next prime is 78829427. The reversal of 78829425 is 52492887.

It can be written as a sum of positive squares in 12 ways, for example, as 12047841 + 66781584 = 3471^2 + 8172^2 .

It is not a de Polignac number, because 78829425 - 2³ = 78829417 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78829427) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 141247 + ... + 141803.

It is an arithmetic number, because the mean of its divisors is an integer number (2136303).

Almost surely, 2^78829425 is an apocalyptic number.

78829425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78829425 is a deficient number, since it is larger than the sum of its proper divisors (74984391).

78829425 is a wasteful number, since it uses less digits than its factorization.

78829425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 619 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 78829425 is about 8878.5936386344. The cubic root of 78829425 is about 428.7749973384.

The spelling of 78829425 in words is "seventy-eight million, eight hundred twenty-nine thousand, four hundred twenty-five".