28811662540 has 24 divisors (see below), whose sum is σ = 63135122400. Its totient is φ = 11023592448.

The previous prime is 28811662519. The next prime is 28811662541. The reversal of 28811662540 is 4526611882.

It is a super-2 number, since 2×28811662540² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28811662541) 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, 31316565 + ... + 31317484.

It is an arithmetic number, because the mean of its divisors is an integer number (2630630100).

Almost surely, 2^28811662540 is an apocalyptic number.

28811662540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28811662540 is an abundant number, since it is smaller than the sum of its proper divisors (34323459860).

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

28811662540 is a wasteful number, since it uses less digits than its factorization.

28811662540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62634081 (or 62634079 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 28811662540 in words is "twenty-eight billion, eight hundred eleven million, six hundred sixty-two thousand, five hundred forty".