78306869 has 4 divisors (see below), whose sum is σ = 78341760. Its totient is φ = 78271980.

The previous prime is 78306817. The next prime is 78306929. The reversal of 78306869 is 96860387.

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 a de Polignac number, because none of the positive numbers 2^k-78306869 is a prime.

It is a super-2 number, since 2×78306869² = 12263931465166322, 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 (78300869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13829 + ... + 18650.

It is an arithmetic number, because the mean of its divisors is an integer number (19585440).

Almost surely, 2^78306869 is an apocalyptic number.

It is an amenable number.

78306869 is a deficient number, since it is larger than the sum of its proper divisors (34891).

78306869 is a wasteful number, since it uses less digits than its factorization.

78306869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34890.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 78306869 is about 8849.1168485900. The cubic root of 78306869 is about 427.8254539817.

The spelling of 78306869 in words is "seventy-eight million, three hundred six thousand, eight hundred sixty-nine".