78264871 has 4 divisors (see below), whose sum is σ = 78326512. Its totient is φ = 78203232.

The previous prime is 78264853. The next prime is 78264887. The reversal of 78264871 is 17846287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17846287 = 2383 ⋅7489.

It is a cyclic number.

It is not a de Polignac number, because 78264871 - 2¹⁷ = 78133799 is a prime.

It is a super-2 number, since 2×78264871² = 12250780065293282, 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 (78264271) 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, 28875 + ... + 31468.

It is an arithmetic number, because the mean of its divisors is an integer number (19581628).

Almost surely, 2^78264871 is an apocalyptic number.

78264871 is a deficient number, since it is larger than the sum of its proper divisors (61641).

78264871 is a wasteful number, since it uses less digits than its factorization.

78264871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61640.

The product of its digits is 150528, while the sum is 43.

The square root of 78264871 is about 8846.7435251622. The cubic root of 78264871 is about 427.7489556838.

The spelling of 78264871 in words is "seventy-eight million, two hundred sixty-four thousand, eight hundred seventy-one".