78427623 has 16 divisors (see below), whose sum is σ = 106724576. Its totient is φ = 51217920.

The previous prime is 78427619. The next prime is 78427627. The reversal of 78427623 is 32672487.

It is an interprime number because it is at equal distance from previous prime (78427619) and next prime (78427627).

It is not a de Polignac number, because 78427623 - 2² = 78427619 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78427627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33243 + ... + 35523.

It is an arithmetic number, because the mean of its divisors is an integer number (6670286).

Almost surely, 2^78427623 is an apocalyptic number.

78427623 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

78427623 is a deficient number, since it is larger than the sum of its proper divisors (28296953).

78427623 is a wasteful number, since it uses less digits than its factorization.

78427623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2514.

The product of its digits is 112896, while the sum is 39.

The square root of 78427623 is about 8855.9371610237. The cubic root of 78427623 is about 428.0452520791.

The spelling of 78427623 in words is "seventy-eight million, four hundred twenty-seven thousand, six hundred twenty-three".