28533337781 has 16 divisors (see below), whose sum is σ = 31730012160. Its totient is φ = 25480344960.

The previous prime is 28533337759. The next prime is 28533337783. The reversal of 28533337781 is 18773333582.

It is a cyclic number.

It is not a de Polignac number, because 28533337781 - 2⁶ = 28533337717 is a prime.

It is a super-2 number, since 2×28533337781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28533337783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1412156 + ... + 1432218.

It is an arithmetic number, because the mean of its divisors is an integer number (1983125760).

Almost surely, 2^28533337781 is an apocalyptic number.

It is an amenable number.

28533337781 is a deficient number, since it is larger than the sum of its proper divisors (3196674379).

28533337781 is a wasteful number, since it uses less digits than its factorization.

28533337781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23636.

The product of its digits is 2540160, while the sum is 50.

The spelling of 28533337781 in words is "twenty-eight billion, five hundred thirty-three million, three hundred thirty-seven thousand, seven hundred eighty-one".