28723615898 has 4 divisors (see below), whose sum is σ = 43085423850. Its totient is φ = 14361807948.

The previous prime is 28723615897. The next prime is 28723615909. The reversal of 28723615898 is 89851632782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 28661474209 + 62141689 = 169297^2 + 7883^2 .

It is a super-2 number, since 2×28723615898² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28723615897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7180903973 + ... + 7180903976.

Almost surely, 2^28723615898 is an apocalyptic number.

28723615898 is a deficient number, since it is larger than the sum of its proper divisors (14361807952).

28723615898 is a wasteful number, since it uses less digits than its factorization.

28723615898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14361807951.

The product of its digits is 11612160, while the sum is 59.

The spelling of 28723615898 in words is "twenty-eight billion, seven hundred twenty-three million, six hundred fifteen thousand, eight hundred ninety-eight".