78528569 has 4 divisors (see below), whose sum is σ = 89746944. Its totient is φ = 67310196.

The previous prime is 78528551. The next prime is 78528589. The reversal of 78528569 is 96582587.

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.

It is a cyclic number.

It is not a de Polignac number, because 78528569 - 2²⁰ = 77479993 is a prime.

It is a super-2 number, since 2×78528569² = 12333472298375522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78528589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5609177 + ... + 5609190.

It is an arithmetic number, because the mean of its divisors is an integer number (22436736).

Almost surely, 2^78528569 is an apocalyptic number.

It is an amenable number.

78528569 is a deficient number, since it is larger than the sum of its proper divisors (11218375).

78528569 is a wasteful number, since it uses less digits than its factorization.

78528569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11218374.

The product of its digits is 1209600, while the sum is 50.

The square root of 78528569 is about 8861.6346686150. The cubic root of 78528569 is about 428.2288223102.

It can be divided in two parts, 78528 and 569, that added together give a palindrome (79097).

The spelling of 78528569 in words is "seventy-eight million, five hundred twenty-eight thousand, five hundred sixty-nine".