28431698367798 has 128 divisors (see below), whose sum is σ = 69038262074880. Its totient is φ = 8601558480000.

The previous prime is 28431698367701. The next prime is 28431698367799. The reversal of 28431698367798 is 89776389613482.

It is a happy number.

28431698367798 is a `hidden beast` number, since 2 + 8 + 4 + 3 + 169 + 8 + 367 + 7 + 98 = 666.

It is a super-2 number, since 2×28431698367798² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431698367799) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1347399448 + ... + 1347420548.

It is an arithmetic number, because the mean of its divisors is an integer number (539361422460).

Almost surely, 2^{28431698367798} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28431698367798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34519131037440).

28431698367798 is an abundant number, since it is smaller than the sum of its proper divisors (40606563707082).

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

28431698367798 is a wasteful number, since it uses less digits than its factorization.

28431698367798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24731 (or 24725 counting only the distinct ones).

The product of its digits is 5267275776, while the sum is 81.

The spelling of 28431698367798 in words is "twenty-eight trillion, four hundred thirty-one billion, six hundred ninety-eight million, three hundred sixty-seven thousand, seven hundred ninety-eight".