28315749551 has 4 divisors (see below), whose sum is σ = 28317900000. Its totient is φ = 28313599104.

The previous prime is 28315749523. The next prime is 28315749557. The reversal of 28315749551 is 15594751382.

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 28315749551 - 2²² = 28311555247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28315749551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315749557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055351 + ... + 1081848.

It is an arithmetic number, because the mean of its divisors is an integer number (7079475000).

Almost surely, 2^28315749551 is an apocalyptic number.

28315749551 is a deficient number, since it is larger than the sum of its proper divisors (2150449).

28315749551 is a wasteful number, since it uses less digits than its factorization.

28315749551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150448.

The product of its digits is 1512000, while the sum is 50.

The spelling of 28315749551 in words is "twenty-eight billion, three hundred fifteen million, seven hundred forty-nine thousand, five hundred fifty-one".