28287989901 has 12 divisors (see below), whose sum is σ = 40867926528. Its totient is φ = 18855199944.

The previous prime is 28287989867. The next prime is 28287989909. The reversal of 28287989901 is 10998978282.

It is not a de Polignac number, because 28287989901 - 2¹⁴ = 28287973517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28287989909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236055 + ... + 335108.

It is an arithmetic number, because the mean of its divisors is an integer number (3405660544).

Almost surely, 2^28287989901 is an apocalyptic number.

It is an amenable number.

28287989901 is a deficient number, since it is larger than the sum of its proper divisors (12579936627).

28287989901 is a wasteful number, since it uses less digits than its factorization.

28287989901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576672 (or 576669 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 28287989901 in words is "twenty-eight billion, two hundred eighty-seven million, nine hundred eighty-nine thousand, nine hundred one".