69781568864 has 24 divisors (see below), whose sum is σ = 157008530448. Its totient is φ = 29906386560.

The previous prime is 69781568863. The next prime is 69781568917. The reversal of 69781568864 is 46886518796.

It is a junction number, because it is equal to n+sod(n) for n = 69781568794 and 69781568803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69781568863) 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, 155762207 + ... + 155762654.

It is an arithmetic number, because the mean of its divisors is an integer number (6542022102).

Almost surely, 2^69781568864 is an apocalyptic number.

It is an amenable number.

69781568864 is an abundant number, since it is smaller than the sum of its proper divisors (87226961584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

69781568864 is a wasteful number, since it uses less digits than its factorization.

69781568864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311524878 (or 311524870 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 68.

The spelling of 69781568864 in words is "sixty-nine billion, seven hundred eighty-one million, five hundred sixty-eight thousand, eight hundred sixty-four".