28081815854 has 4 divisors (see below), whose sum is σ = 42122723784. Its totient is φ = 14040907926.

The previous prime is 28081815841. The next prime is 28081815859. The reversal of 28081815854 is 45851818082.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081815859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7020453962 + ... + 7020453965.

It is an arithmetic number, because the mean of its divisors is an integer number (10530680946).

Almost surely, 2^28081815854 is an apocalyptic number.

28081815854 is a deficient number, since it is larger than the sum of its proper divisors (14040907930).

28081815854 is a wasteful number, since it uses less digits than its factorization.

28081815854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14040907929.

The product of its (nonzero) digits is 819200, while the sum is 50.

The spelling of 28081815854 in words is "twenty-eight billion, eighty-one million, eight hundred fifteen thousand, eight hundred fifty-four".