78672575647 has 4 divisors (see below), whose sum is σ = 78675677136. Its totient is φ = 78669474160.

The previous prime is 78672575629. The next prime is 78672575671. The reversal of 78672575647 is 74657527687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78672575647 - 2²³ = 78664187039 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 (78672575347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1512379 + ... + 1563532.

It is an arithmetic number, because the mean of its divisors is an integer number (19668919284).

Almost surely, 2^78672575647 is an apocalyptic number.

78672575647 is a deficient number, since it is larger than the sum of its proper divisors (3101489).

78672575647 is a wasteful number, since it uses less digits than its factorization.

78672575647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3101488.

The product of its digits is 138297600, while the sum is 64.

The spelling of 78672575647 in words is "seventy-eight billion, six hundred seventy-two million, five hundred seventy-five thousand, six hundred forty-seven".