28077521888 has 24 divisors (see below), whose sum is σ = 59529746808. Its totient is φ = 12958856064.

The previous prime is 28077521881. The next prime is 28077521911. The reversal of 28077521888 is 88812577082.

It is a super-2 number, since 2×28077521888² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28077521881) 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, 33746606 + ... + 33747437.

It is an arithmetic number, because the mean of its divisors is an integer number (2480406117).

Almost surely, 2^28077521888 is an apocalyptic number.

It is an amenable number.

28077521888 is an abundant number, since it is smaller than the sum of its proper divisors (31452224920).

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

28077521888 is a wasteful number, since it uses less digits than its factorization.

28077521888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67494066 (or 67494058 counting only the distinct ones).

The product of its (nonzero) digits is 4014080, while the sum is 56.

The spelling of 28077521888 in words is "twenty-eight billion, seventy-seven million, five hundred twenty-one thousand, eight hundred eighty-eight".