28315430691 has 16 divisors (see below), whose sum is σ = 37890892704. Its totient is φ = 18808568064.

The previous prime is 28315430687. The next prime is 28315430761. The reversal of 28315430691 is 19603451382.

It is not a de Polignac number, because 28315430691 - 2² = 28315430687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28315430621) 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, 1103281 + ... + 1128653.

It is an arithmetic number, because the mean of its divisors is an integer number (2368180794).

Almost surely, 2^28315430691 is an apocalyptic number.

28315430691 is a deficient number, since it is larger than the sum of its proper divisors (9575462013).

28315430691 is a wasteful number, since it uses less digits than its factorization.

28315430691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26710.

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 28315430691 in words is "twenty-eight billion, three hundred fifteen million, four hundred thirty thousand, six hundred ninety-one".