78642023 has 2 divisors, whose sum is σ = 78642024. Its totient is φ = 78642022.

The previous prime is 78641999. The next prime is 78642029. The reversal of 78642023 is 32024687.

It is a strong prime.

It is an emirp because it is prime and its reverse (32024687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78642023 - 2¹⁰ = 78640999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78642029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39321011 + 39321012.

It is an arithmetic number, because the mean of its divisors is an integer number (39321012).

Almost surely, 2^78642023 is an apocalyptic number.

78642023 is a deficient number, since it is larger than the sum of its proper divisors (1).

78642023 is an equidigital number, since it uses as much as digits as its factorization.

78642023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 78642023 is about 8868.0337730525. The cubic root of 78642023 is about 428.4349506651.

The spelling of 78642023 in words is "seventy-eight million, six hundred forty-two thousand, twenty-three".