78252529 has 2 divisors, whose sum is σ = 78252530. Its totient is φ = 78252528.

The previous prime is 78252523. The next prime is 78252553. The reversal of 78252529 is 92525287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78145600 + 106929 = 8840^2 + 327^2 .

It is an emirp because it is prime and its reverse (92525287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78252529 - 2¹¹ = 78250481 is a prime.

It is a super-2 number, since 2×78252529² = 12246916589791682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78252491 and 78252500.

It is not a weakly prime, because it can be changed into another prime (78252523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39126264 + 39126265.

It is an arithmetic number, because the mean of its divisors is an integer number (39126265).

Almost surely, 2^78252529 is an apocalyptic number.

It is an amenable number.

78252529 is a deficient number, since it is larger than the sum of its proper divisors (1).

78252529 is an equidigital number, since it uses as much as digits as its factorization.

78252529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 78252529 is about 8846.0459528537. The cubic root of 78252529 is about 427.7264698394.

The spelling of 78252529 in words is "seventy-eight million, two hundred fifty-two thousand, five hundred twenty-nine".