78347025 has 18 divisors (see below), whose sum is σ = 140328630. Its totient is φ = 41784960.

The previous prime is 78347021. The next prime is 78347041. The reversal of 78347025 is 52074387.

It can be written as a sum of positive squares in 3 ways, for example, as 11614464 + 66732561 = 3408^2 + 8169^2 .

It is not a de Polignac number, because 78347025 - 2² = 78347021 is a prime.

It is a super-2 number, since 2×78347025² = 12276512652701250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78347021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 173880 + ... + 174329.

It is an arithmetic number, because the mean of its divisors is an integer number (7796035).

Almost surely, 2^78347025 is an apocalyptic number.

78347025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78347025 is a deficient number, since it is larger than the sum of its proper divisors (61981605).

78347025 is a wasteful number, since it uses less digits than its factorization.

78347025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348225 (or 348217 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 78347025 is about 8851.3854847702. The cubic root of 78347025 is about 427.8985715485.

The spelling of 78347025 in words is "seventy-eight million, three hundred forty-seven thousand, twenty-five".