28316256551 has 4 divisors (see below), whose sum is σ = 30890461704. Its totient is φ = 25742051400.

The previous prime is 28316256541. The next prime is 28316256557. The reversal of 28316256551 is 15565261382.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28316256551 - 2⁶ = 28316256487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28316256557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287102560 + ... + 1287102581.

It is an arithmetic number, because the mean of its divisors is an integer number (7722615426).

Almost surely, 2^28316256551 is an apocalyptic number.

28316256551 is a deficient number, since it is larger than the sum of its proper divisors (2574205153).

28316256551 is a wasteful number, since it uses less digits than its factorization.

28316256551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574205152.

The product of its digits is 432000, while the sum is 44.

The spelling of 28316256551 in words is "twenty-eight billion, three hundred sixteen million, two hundred fifty-six thousand, five hundred fifty-one".