78384868947 has 72 divisors (see below), whose sum is σ = 147023173440. Its totient is φ = 39772343520.

The previous prime is 78384868937. The next prime is 78384868981. The reversal of 78384868947 is 74986848387.

78384868947 is a `hidden beast` number, since 78 + 38 + 486 + 8 + 9 + 47 = 666.

It is not a de Polignac number, because 78384868947 - 2¹⁰ = 78384867923 is a prime.

It is a super-2 number, since 2×78384868947² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78384868937) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 20704 + ... + 396482.

It is an arithmetic number, because the mean of its divisors is an integer number (2041988520).

Almost surely, 2^78384868947 is an apocalyptic number.

78384868947 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

78384868947 is a deficient number, since it is larger than the sum of its proper divisors (68638304493).

78384868947 is a wasteful number, since it uses less digits than its factorization.

78384868947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375853 (or 375843 counting only the distinct ones).

The product of its digits is 520224768, while the sum is 72.

The spelling of 78384868947 in words is "seventy-eight billion, three hundred eighty-four million, eight hundred sixty-eight thousand, nine hundred forty-seven".