78162823 has 4 divisors (see below), whose sum is σ = 78191568. Its totient is φ = 78134080.

The previous prime is 78162817. The next prime is 78162829. The reversal of 78162823 is 32826187.

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

It is an interprime number because it is at equal distance from previous prime (78162817) and next prime (78162829).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78162823 is a prime.

It is a super-2 number, since 2×78162823² = 12218853798658658, 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 (78162829) 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, 9811 + ... + 15892.

It is an arithmetic number, because the mean of its divisors is an integer number (19547892).

Almost surely, 2^78162823 is an apocalyptic number.

78162823 is a deficient number, since it is larger than the sum of its proper divisors (28745).

78162823 is a wasteful number, since it uses less digits than its factorization.

78162823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28744.

The product of its digits is 32256, while the sum is 37.

The square root of 78162823 is about 8840.9740979148. The cubic root of 78162823 is about 427.5629637206.

The spelling of 78162823 in words is "seventy-eight million, one hundred sixty-two thousand, eight hundred twenty-three".