78356423 has 4 divisors (see below), whose sum is σ = 81763248. Its totient is φ = 74949600.

The previous prime is 78356407. The next prime is 78356429. The reversal of 78356423 is 32465387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32465387 = 43 ⋅755009.

It is a cyclic number.

It is not a de Polignac number, because 78356423 - 2⁴ = 78356407 is a prime.

It is a super-2 number, since 2×78356423² = 12279458050709858, 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 (78356429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1703378 + ... + 1703423.

It is an arithmetic number, because the mean of its divisors is an integer number (20440812).

Almost surely, 2^78356423 is an apocalyptic number.

78356423 is a deficient number, since it is larger than the sum of its proper divisors (3406825).

78356423 is a wasteful number, since it uses less digits than its factorization.

78356423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406824.

The product of its digits is 120960, while the sum is 38.

The square root of 78356423 is about 8851.9163461931. The cubic root of 78356423 is about 427.9156801751.

The spelling of 78356423 in words is "seventy-eight million, three hundred fifty-six thousand, four hundred twenty-three".