78258825 has 48 divisors (see below), whose sum is σ = 144633600. Its totient is φ = 41486400.

The previous prime is 78258821. The next prime is 78258833. The reversal of 78258825 is 52885287.

It is not a de Polignac number, because 78258825 - 2² = 78258821 is a prime.

It is a super-2 number, since 2×78258825² = 12248887380761250, which contains 22 as substring.

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 (78258821) 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, 181360 + ... + 181790.

It is an arithmetic number, because the mean of its divisors is an integer number (3013200).

Almost surely, 2^78258825 is an apocalyptic number.

78258825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78258825 is a deficient number, since it is larger than the sum of its proper divisors (66374775).

78258825 is a wasteful number, since it uses less digits than its factorization.

78258825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719 (or 708 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 78258825 is about 8846.4018109059. The cubic root of 78258825 is about 427.7379407941.

The spelling of 78258825 in words is "seventy-eight million, two hundred fifty-eight thousand, eight hundred twenty-five".