78273625 has 8 divisors (see below), whose sum is σ = 97685640. Its totient is φ = 62618800.

The previous prime is 78273607. The next prime is 78273647. The reversal of 78273625 is 52637287.

It can be written as a sum of positive squares in 4 ways, for example, as 2374681 + 75898944 = 1541^2 + 8712^2 .

It is not a de Polignac number, because 78273625 - 2⁹ = 78273113 is a prime.

It is a super-2 number, since 2×78273625² = 12253520741281250, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312970 + ... + 313219.

It is an arithmetic number, because the mean of its divisors is an integer number (12210705).

Almost surely, 2^78273625 is an apocalyptic number.

It is an amenable number.

78273625 is a deficient number, since it is larger than the sum of its proper divisors (19412015).

78273625 is an equidigital number, since it uses as much as digits as its factorization.

78273625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626204 (or 626194 counting only the distinct ones).

The product of its digits is 141120, while the sum is 40.

The square root of 78273625 is about 8847.2382696523. The cubic root of 78273625 is about 427.7649031313.

The spelling of 78273625 in words is "seventy-eight million, two hundred seventy-three thousand, six hundred twenty-five".