28893987461 has 4 divisors (see below), whose sum is σ = 28988104992. Its totient is φ = 28799869932.

The previous prime is 28893987427. The next prime is 28893987469. The reversal of 28893987461 is 16478939882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28893987461 is a prime.

It is a super-2 number, since 2×28893987461² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28893987469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47058305 + ... + 47058918.

It is an arithmetic number, because the mean of its divisors is an integer number (7247026248).

Almost surely, 2^28893987461 is an apocalyptic number.

It is an amenable number.

28893987461 is a deficient number, since it is larger than the sum of its proper divisors (94117531).

28893987461 is an equidigital number, since it uses as much as digits as its factorization.

28893987461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94117530.

The product of its digits is 41803776, while the sum is 65.

The spelling of 28893987461 in words is "twenty-eight billion, eight hundred ninety-three million, nine hundred eighty-seven thousand, four hundred sixty-one".