78834500639 has 16 divisors (see below), whose sum is σ = 83840562432. Its totient is φ = 73869763968.

The previous prime is 78834500629. The next prime is 78834500651. The reversal of 78834500639 is 93600543887.

It is a cyclic number.

It is not a de Polignac number, because 78834500639 - 2⁸ = 78834500383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78834500629) 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, 8951012 + ... + 8959814.

It is an arithmetic number, because the mean of its divisors is an integer number (5240035152).

Almost surely, 2^78834500639 is an apocalyptic number.

78834500639 is a deficient number, since it is larger than the sum of its proper divisors (5006061793).

78834500639 is a wasteful number, since it uses less digits than its factorization.

78834500639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11086.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 78834500639 in words is "seventy-eight billion, eight hundred thirty-four million, five hundred thousand, six hundred thirty-nine".