28665410640 has 40 divisors (see below), whose sum is σ = 88862773728. Its totient is φ = 7644109440.

The previous prime is 28665410617. The next prime is 28665410689. The reversal of 28665410640 is 4601456682.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 28665410592 and 28665410601.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 59719366 + ... + 59719845.

Almost surely, 2^28665410640 is an apocalyptic number.

28665410640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28665410640 is an abundant number, since it is smaller than the sum of its proper divisors (60197363088).

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

28665410640 is a wasteful number, since it uses less digits than its factorization.

28665410640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119439227 (or 119439221 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 28665410640 in words is "twenty-eight billion, six hundred sixty-five million, four hundred ten thousand, six hundred forty".