128000785637684 has 24 divisors (see below), whose sum is σ = 227795868709416. Its totient is φ = 62917379280000.

The previous prime is 128000785637639. The next prime is 128000785637689. The reversal of 128000785637684 is 486736587000821.

It can be written as a sum of positive squares in 4 ways, for example, as 21972000004900 + 106028785632784 = 4687430^2 + 10297028^2 .

It is a super-2 number, since 2×128000785637684² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128000785637684.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128000785637689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140489867 + ... + 141398034.

It is an arithmetic number, because the mean of its divisors is an integer number (9491494529559).

Almost surely, 2^{128000785637684} is an apocalyptic number.

It is an amenable number.

128000785637684 is a deficient number, since it is larger than the sum of its proper divisors (99795083071732).

128000785637684 is a wasteful number, since it uses less digits than its factorization.

128000785637684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281889827 (or 281889825 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 65.

The spelling of 128000785637684 in words is "one hundred twenty-eight trillion, seven hundred eighty-five million, six hundred thirty-seven thousand, six hundred eighty-four".