78852521 has 4 divisors (see below), whose sum is σ = 86020944. Its totient is φ = 71684100.

The previous prime is 78852509. The next prime is 78852523. The reversal of 78852521 is 12525887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12525887 = 11 ⋅1138717.

It is a cyclic number.

It is not a de Polignac number, because 78852521 - 2⁶ = 78852457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78852523) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3584195 + ... + 3584216.

It is an arithmetic number, because the mean of its divisors is an integer number (21505236).

Almost surely, 2^78852521 is an apocalyptic number.

It is an amenable number.

78852521 is a deficient number, since it is larger than the sum of its proper divisors (7168423).

78852521 is a wasteful number, since it uses less digits than its factorization.

78852521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7168422.

The product of its digits is 44800, while the sum is 38.

The square root of 78852521 is about 8879.8941998202. The cubic root of 78852521 is about 428.8168684221.

The spelling of 78852521 in words is "seventy-eight million, eight hundred fifty-two thousand, five hundred twenty-one".