78252823 has 4 divisors (see below), whose sum is σ = 85366728. Its totient is φ = 71138920.

The previous prime is 78252803. The next prime is 78252847. The reversal of 78252823 is 32825287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32825287 = 11 ⋅2984117.

It is a cyclic number.

It is not a de Polignac number, because 78252823 - 2⁹ = 78252311 is a prime.

It is a super-2 number, since 2×78252823² = 12247008614938658, 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 (78252803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3556936 + ... + 3556957.

It is an arithmetic number, because the mean of its divisors is an integer number (21341682).

Almost surely, 2^78252823 is an apocalyptic number.

78252823 is a deficient number, since it is larger than the sum of its proper divisors (7113905).

78252823 is a wasteful number, since it uses less digits than its factorization.

78252823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7113904.

The product of its digits is 53760, while the sum is 37.

The square root of 78252823 is about 8846.0625704321. The cubic root of 78252823 is about 427.7270055044.

It can be divided in two parts, 7825 and 2823, that added together give a cube (10648 = 22³).

The spelling of 78252823 in words is "seventy-eight million, two hundred fifty-two thousand, eight hundred twenty-three".