78287069 has 4 divisors (see below), whose sum is σ = 89470944. Its totient is φ = 67103196.

The previous prime is 78287063. The next prime is 78287089. The reversal of 78287069 is 96078287.

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 78287069 - 2²⁴ = 61509853 is a prime.

It is a super-2 number, since 2×78287069² = 12257730345221522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78287063) 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, 5591927 + ... + 5591940.

It is an arithmetic number, because the mean of its divisors is an integer number (22367736).

Almost surely, 2^78287069 is an apocalyptic number.

It is an amenable number.

78287069 is a deficient number, since it is larger than the sum of its proper divisors (11183875).

78287069 is a wasteful number, since it uses less digits than its factorization.

78287069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11183874.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 78287069 is about 8847.9980221517. The cubic root of 78287069 is about 427.7893921898.

The spelling of 78287069 in words is "seventy-eight million, two hundred eighty-seven thousand, sixty-nine".