28342284578 has 4 divisors (see below), whose sum is σ = 42513426870. Its totient is φ = 14171142288.

The previous prime is 28342284577. The next prime is 28342284613. The reversal of 28342284578 is 87548224382.

It is a happy number.

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., 21870564769 + 6471719809 = 147887^2 + 80447^2 .

It is not an unprimeable number, because it can be changed into a prime (28342284577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7085571143 + ... + 7085571146.

Almost surely, 2^28342284578 is an apocalyptic number.

28342284578 is a deficient number, since it is larger than the sum of its proper divisors (14171142292).

28342284578 is a wasteful number, since it uses less digits than its factorization.

28342284578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14171142291.

The product of its digits is 6881280, while the sum is 53.

The spelling of 28342284578 in words is "twenty-eight billion, three hundred forty-two million, two hundred eighty-four thousand, five hundred seventy-eight".