28190953721 has 8 divisors (see below), whose sum is σ = 32580236160. Its totient is φ = 23892172128.

The previous prime is 28190953667. The next prime is 28190953741. The reversal of 28190953721 is 12735909182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28190953721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28190953741) 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, 22624541 + ... + 22625786.

It is an arithmetic number, because the mean of its divisors is an integer number (4072529520).

Almost surely, 2^28190953721 is an apocalyptic number.

It is an amenable number.

28190953721 is a deficient number, since it is larger than the sum of its proper divisors (4389282439).

28190953721 is an equidigital number, since it uses as much as digits as its factorization.

28190953721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45250423.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 28190953721 in words is "twenty-eight billion, one hundred ninety million, nine hundred fifty-three thousand, seven hundred twenty-one".