21784628536 has 32 divisors (see below), whose sum is σ = 44565721200. Its totient is φ = 9900714240.

The previous prime is 21784628533. The next prime is 21784628561. The reversal of 21784628536 is 63582648712.

It is a super-3 number, since 3×21784628536³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21784628533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868426 + ... + 893158.

Almost surely, 2^21784628536 is an apocalyptic number.

It is an amenable number.

21784628536 is an abundant number, since it is smaller than the sum of its proper divisors (22781092664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21784628536 is a wasteful number, since it uses less digits than its factorization.

21784628536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34759 (or 34755 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The spelling of 21784628536 in words is "twenty-one billion, seven hundred eighty-four million, six hundred twenty-eight thousand, five hundred thirty-six".