78454223 has 2 divisors, whose sum is σ = 78454224. Its totient is φ = 78454222.

The previous prime is 78454217. The next prime is 78454267. The reversal of 78454223 is 32245487.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78454223 is a prime.

It is a Sophie Germain prime.

It is equal to p_4584428 and since 78454223 and 4584428 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78454423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39227111 + 39227112.

It is an arithmetic number, because the mean of its divisors is an integer number (39227112).

Almost surely, 2^78454223 is an apocalyptic number.

78454223 is a deficient number, since it is larger than the sum of its proper divisors (1).

78454223 is an equidigital number, since it uses as much as digits as its factorization.

78454223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 35.

The square root of 78454223 is about 8857.4388510449. The cubic root of 78454223 is about 428.0936394384.

The spelling of 78454223 in words is "seventy-eight million, four hundred fifty-four thousand, two hundred twenty-three".