78723825 has 48 divisors (see below), whose sum is σ = 138848256. Its totient is φ = 39265600.

The previous prime is 78723817. The next prime is 78723829. The reversal of 78723825 is 52832787.

It is not a de Polignac number, because 78723825 - 2³ = 78723817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78723829) 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, 80590 + ... + 81560.

It is an arithmetic number, because the mean of its divisors is an integer number (2892672).

Almost surely, 2^78723825 is an apocalyptic number.

78723825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78723825 is a deficient number, since it is larger than the sum of its proper divisors (60124431).

78723825 is a wasteful number, since it uses less digits than its factorization.

78723825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1049 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 78723825 is about 8872.6447579062. The cubic root of 78723825 is about 428.5834492660.

The spelling of 78723825 in words is "seventy-eight million, seven hundred twenty-three thousand, eight hundred twenty-five".