28347966640 has 40 divisors (see below), whose sum is σ = 75324598560. Its totient is φ = 9719302656.

The previous prime is 28347966613. The next prime is 28347966641. The reversal of 28347966640 is 4666974382.

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

It is not an unprimeable number, because it can be changed into a prime (28347966641) by changing a digit.

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, 25310125 + ... + 25311244.

It is an arithmetic number, because the mean of its divisors is an integer number (1883114964).

Almost surely, 2^28347966640 is an apocalyptic number.

28347966640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28347966640 is an abundant number, since it is smaller than the sum of its proper divisors (46976631920).

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

28347966640 is a wasteful number, since it uses less digits than its factorization.

28347966640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50621389 (or 50621383 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 55.

The spelling of 28347966640 in words is "twenty-eight billion, three hundred forty-seven million, nine hundred sixty-six thousand, six hundred forty".