78354823 has 4 divisors (see below), whose sum is σ = 78442120. Its totient is φ = 78267528.

The previous prime is 78354817. The next prime is 78354827. The reversal of 78354823 is 32845387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32845387 = 41 ⋅801107.

It is a cyclic number.

It is not a de Polignac number, because 78354823 - 2⁵ = 78354791 is a prime.

It is a super-2 number, since 2×78354823² = 12278956574722658, 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 (78354827) 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, 42288 + ... + 44101.

It is an arithmetic number, because the mean of its divisors is an integer number (19610530).

Almost surely, 2^78354823 is an apocalyptic number.

78354823 is the 4732-nd centered heptagonal number.

78354823 is a deficient number, since it is larger than the sum of its proper divisors (87297).

78354823 is an equidigital number, since it uses as much as digits as its factorization.

78354823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87296.

The product of its digits is 161280, while the sum is 40.

The square root of 78354823 is about 8851.8259698211. The cubic root of 78354823 is about 427.9127675453.

The spelling of 78354823 in words is "seventy-eight million, three hundred fifty-four thousand, eight hundred twenty-three".