78331265 has 16 divisors (see below), whose sum is σ = 98273280. Its totient is φ = 59866560.

The previous prime is 78331229. The next prime is 78331273. The reversal of 78331265 is 56213387.

It is not a de Polignac number, because 78331265 - 2¹⁶ = 78265729 is a prime.

It is a super-2 number, since 2×78331265² = 12271574153000450, which contains 22 as substring.

It is an unprimeable number.

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, 9047 + ... + 15443.

It is an arithmetic number, because the mean of its divisors is an integer number (6142080).

Almost surely, 2^78331265 is an apocalyptic number.

It is an amenable number.

78331265 is a deficient number, since it is larger than the sum of its proper divisors (19942015).

78331265 is a wasteful number, since it uses less digits than its factorization.

78331265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6512.

The product of its digits is 30240, while the sum is 35.

The square root of 78331265 is about 8850.4951838866. The cubic root of 78331265 is about 427.8698781224.

The spelling of 78331265 in words is "seventy-eight million, three hundred thirty-one thousand, two hundred sixty-five".