42809865764 has 12 divisors (see below), whose sum is σ = 75464107404. Its totient is φ = 21248692224.

The previous prime is 42809865727. The next prime is 42809865773. The reversal of 42809865764 is 46756890824.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27878980900 + 14930884864 = 166970^2 + 122192^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39059549 + ... + 39060644.

It is an arithmetic number, because the mean of its divisors is an integer number (6288675617).

Almost surely, 2^42809865764 is an apocalyptic number.

It is an amenable number.

42809865764 is a deficient number, since it is larger than the sum of its proper divisors (32654241640).

42809865764 is a wasteful number, since it uses less digits than its factorization.

42809865764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78120334 (or 78120332 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 59.

The spelling of 42809865764 in words is "forty-two billion, eight hundred nine million, eight hundred sixty-five thousand, seven hundred sixty-four".