28946636491 has 32 divisors (see below), whose sum is σ = 32445282240. Its totient is φ = 25698226176.

The previous prime is 28946636489. The next prime is 28946636507. The reversal of 28946636491 is 19463664982.

It is a cyclic number.

It is not a de Polignac number, because 28946636491 - 2¹ = 28946636489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28946636471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3847065 + ... + 3854581.

It is an arithmetic number, because the mean of its divisors is an integer number (1013915070).

Almost surely, 2^28946636491 is an apocalyptic number.

28946636491 is a deficient number, since it is larger than the sum of its proper divisors (3498645749).

28946636491 is a wasteful number, since it uses less digits than its factorization.

28946636491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7743.

The product of its digits is 13436928, while the sum is 58.

The spelling of 28946636491 in words is "twenty-eight billion, nine hundred forty-six million, six hundred thirty-six thousand, four hundred ninety-one".