78384046881 has 16 divisors (see below), whose sum is σ = 120881424384. Its totient is φ = 44251233744.

The previous prime is 78384046877. The next prime is 78384046919. The reversal of 78384046881 is 18864048387.

It is a happy number.

It is not a de Polignac number, because 78384046881 - 2² = 78384046877 is a prime.

It is a super-2 number, since 2×78384046881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78384046781) 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, 22483641 + ... + 22487126.

It is an arithmetic number, because the mean of its divisors is an integer number (7555089024).

Almost surely, 2^78384046881 is an apocalyptic number.

It is an amenable number.

78384046881 is a deficient number, since it is larger than the sum of its proper divisors (42497377503).

78384046881 is a wasteful number, since it uses less digits than its factorization.

78384046881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44970860.

The product of its (nonzero) digits is 8257536, while the sum is 57.

The spelling of 78384046881 in words is "seventy-eight billion, three hundred eighty-four million, forty-six thousand, eight hundred eighty-one".