78539225 has 6 divisors (see below), whose sum is σ = 97388670. Its totient is φ = 62831360.

The previous prime is 78539203. The next prime is 78539233. The reversal of 78539225 is 52293587.

It can be written as a sum of positive squares in 3 ways, for example, as 21904 + 78517321 = 148^2 + 8861^2 .

It is not a de Polignac number, because 78539225 - 2⁶ = 78539161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1570760 + ... + 1570809.

It is an arithmetic number, because the mean of its divisors is an integer number (16231445).

Almost surely, 2^78539225 is an apocalyptic number.

It is an amenable number.

78539225 is a deficient number, since it is larger than the sum of its proper divisors (18849445).

78539225 is a wasteful number, since it uses less digits than its factorization.

78539225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141579 (or 3141574 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 78539225 is about 8862.2358916923. The cubic root of 78539225 is about 428.2481910572.

The spelling of 78539225 in words is "seventy-eight million, five hundred thirty-nine thousand, two hundred twenty-five".