78302865 has 16 divisors (see below), whose sum is σ = 125512128. Its totient is φ = 41685696.

The previous prime is 78302863. The next prime is 78302891. The reversal of 78302865 is 56820387.

It is not a de Polignac number, because 78302865 - 2¹ = 78302863 is a prime.

It is a super-2 number, since 2×78302865² = 12262677334416450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78302863) 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 15 ways as a sum of consecutive naturals, for example, 4359 + ... + 13251.

It is an arithmetic number, because the mean of its divisors is an integer number (7844508).

Almost surely, 2^78302865 is an apocalyptic number.

It is an amenable number.

78302865 is a deficient number, since it is larger than the sum of its proper divisors (47209263).

78302865 is a wasteful number, since it uses less digits than its factorization.

78302865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 78302865 is about 8848.8906084322. The cubic root of 78302865 is about 427.8181619764.

The spelling of 78302865 in words is "seventy-eight million, three hundred two thousand, eight hundred sixty-five".