28937471691 has 16 divisors (see below), whose sum is σ = 38643471776. Its totient is φ = 19261587456.

The previous prime is 28937471653. The next prime is 28937471711. The reversal of 28937471691 is 19617473982.

It is a happy number.

It is not a de Polignac number, because 28937471691 - 2¹⁴ = 28937455307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28937471291) 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, 9797871 + ... + 9800823.

It is an arithmetic number, because the mean of its divisors is an integer number (2415216986).

Almost surely, 2^28937471691 is an apocalyptic number.

28937471691 is a deficient number, since it is larger than the sum of its proper divisors (9706000085).

28937471691 is a wasteful number, since it uses less digits than its factorization.

28937471691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942.

The product of its digits is 4572288, while the sum is 57.

The spelling of 28937471691 in words is "twenty-eight billion, nine hundred thirty-seven million, four hundred seventy-one thousand, six hundred ninety-one".