78738883647 has 16 divisors (see below), whose sum is σ = 107461685760. Its totient is φ = 51255130752.

The previous prime is 78738883627. The next prime is 78738883661. The reversal of 78738883647 is 74638883787.

It is not a de Polignac number, because 78738883647 - 2¹² = 78738879551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78738883627) 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, 304503 + ... + 500199.

It is an arithmetic number, because the mean of its divisors is an integer number (6716355360).

Almost surely, 2^78738883647 is an apocalyptic number.

78738883647 is a deficient number, since it is larger than the sum of its proper divisors (28722802113).

78738883647 is a wasteful number, since it uses less digits than its factorization.

78738883647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198862.

The product of its digits is 303464448, while the sum is 69.

The spelling of 78738883647 in words is "seventy-eight billion, seven hundred thirty-eight million, eight hundred eighty-three thousand, six hundred forty-seven".