28949746661 has 8 divisors (see below), whose sum is σ = 31583188224. Its totient is φ = 26316579520.

The previous prime is 28949746649. The next prime is 28949746669. The reversal of 28949746661 is 16664794982.

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

It is a de Polignac number, because none of the positive numbers 2^k-28949746661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28949746594 and 28949746603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28949746669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196556 + ... + 310698.

It is an arithmetic number, because the mean of its divisors is an integer number (3947898528).

Almost surely, 2^28949746661 is an apocalyptic number.

It is an amenable number.

28949746661 is a deficient number, since it is larger than the sum of its proper divisors (2633441563).

28949746661 is a wasteful number, since it uses less digits than its factorization.

28949746661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137211.

The product of its digits is 31352832, while the sum is 62.

The spelling of 28949746661 in words is "twenty-eight billion, nine hundred forty-nine million, seven hundred forty-six thousand, six hundred sixty-one".