78266747 has 4 divisors (see below), whose sum is σ = 84287280. Its totient is φ = 72246216.

The previous prime is 78266717. The next prime is 78266761. The reversal of 78266747 is 74766287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78266747 - 2¹⁴ = 78250363 is a prime.

It is a super-2 number, since 2×78266747² = 12251367371924018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78266707) 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, 3010247 + ... + 3010272.

It is an arithmetic number, because the mean of its divisors is an integer number (21071820).

Almost surely, 2^78266747 is an apocalyptic number.

78266747 is a deficient number, since it is larger than the sum of its proper divisors (6020533).

78266747 is a wasteful number, since it uses less digits than its factorization.

78266747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6020532.

The product of its digits is 790272, while the sum is 47.

The square root of 78266747 is about 8846.8495522417. The cubic root of 78266747 is about 427.7523733544.

The spelling of 78266747 in words is "seventy-eight million, two hundred sixty-six thousand, seven hundred forty-seven".