78642873 has 8 divisors (see below), whose sum is σ = 116508000. Its totient is φ = 52428564.

The previous prime is 78642853. The next prime is 78642923. The reversal of 78642873 is 37824687.

It is a happy number.

It is not a de Polignac number, because 78642873 - 2⁸ = 78642617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78642853) 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 in 7 ways as a sum of consecutive naturals, for example, 1456323 + ... + 1456376.

It is an arithmetic number, because the mean of its divisors is an integer number (14563500).

Almost surely, 2^78642873 is an apocalyptic number.

It is an amenable number.

78642873 is a deficient number, since it is larger than the sum of its proper divisors (37865127).

78642873 is a wasteful number, since it uses less digits than its factorization.

78642873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912708 (or 2912702 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 78642873 is about 8868.0816978645. The cubic root of 78642873 is about 428.4364942351.

The spelling of 78642873 in words is "seventy-eight million, six hundred forty-two thousand, eight hundred seventy-three".