78798825 has 144 divisors (see below), whose sum is σ = 178738560. Its totient is φ = 33592320.

The previous prime is 78798821. The next prime is 78798857. The reversal of 78798825 is 52889787.

It is not a de Polignac number, because 78798825 - 2² = 78798821 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78798821) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 722871 + ... + 722979.

It is an arithmetic number, because the mean of its divisors is an integer number (1241240).

Almost surely, 2^78798825 is an apocalyptic number.

78798825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78798825 is an abundant number, since it is smaller than the sum of its proper divisors (99939735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78798825 is a wasteful number, since it uses less digits than its factorization.

78798825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 141 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 54.

The square root of 78798825 is about 8876.8702254792. The cubic root of 78798825 is about 428.7195095431.

The spelling of 78798825 in words is "seventy-eight million, seven hundred ninety-eight thousand, eight hundred twenty-five".