28395967640 has 16 divisors (see below), whose sum is σ = 63890927280. Its totient is φ = 11358387040.

The previous prime is 28395967591. The next prime is 28395967651. The reversal of 28395967640 is 4676959382.

It is a self number, because there is not a number n which added to its sum of digits gives 28395967640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354949556 + ... + 354949635.

It is an arithmetic number, because the mean of its divisors is an integer number (3993182955).

Almost surely, 2^28395967640 is an apocalyptic number.

28395967640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28395967640 is an abundant number, since it is smaller than the sum of its proper divisors (35494959640).

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

28395967640 is a wasteful number, since it uses less digits than its factorization.

28395967640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709899202 (or 709899198 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 59.

The spelling of 28395967640 in words is "twenty-eight billion, three hundred ninety-five million, nine hundred sixty-seven thousand, six hundred forty".