28150994691 has 16 divisors (see below), whose sum is σ = 41719031200. Its totient is φ = 18761095584.

The previous prime is 28150994621. The next prime is 28150994699. The reversal of 28150994691 is 19649905182.

28150994691 is a `hidden beast` number, since 2 + 8 + 1 + 509 + 9 + 46 + 91 = 666.

It is not a de Polignac number, because 28150994691 - 2¹⁰ = 28150993667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28150994699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89656 + ... + 253653.

It is an arithmetic number, because the mean of its divisors is an integer number (2607439450).

Almost surely, 2^28150994691 is an apocalyptic number.

28150994691 is a deficient number, since it is larger than the sum of its proper divisors (13568036509).

28150994691 is a wasteful number, since it uses less digits than its factorization.

28150994691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346355 (or 346349 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 28150994691 in words is "twenty-eight billion, one hundred fifty million, nine hundred ninety-four thousand, six hundred ninety-one".