28888935785 has 8 divisors (see below), whose sum is σ = 34764931080. Its totient is φ = 23045676544.

The previous prime is 28888935781. The next prime is 28888935791. The reversal of 28888935785 is 58753988882.

It can be written as a sum of positive squares in 4 ways, for example, as 2117104144 + 26771831641 = 46012^2 + 163621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28888935785 - 2² = 28888935781 is a prime.

It is a super-2 number, since 2×28888935785² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28888935781) 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, 8182070 + ... + 8185599.

It is an arithmetic number, because the mean of its divisors is an integer number (4345616385).

Almost surely, 2^28888935785 is an apocalyptic number.

It is an amenable number.

28888935785 is a deficient number, since it is larger than the sum of its proper divisors (5875995295).

28888935785 is a wasteful number, since it uses less digits than its factorization.

28888935785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16368027.

The product of its digits is 309657600, while the sum is 71.

The spelling of 28888935785 in words is "twenty-eight billion, eight hundred eighty-eight million, nine hundred thirty-five thousand, seven hundred eighty-five".