28326635421 has 32 divisors (see below), whose sum is σ = 43471358208. Its totient is φ = 16071790080.

The previous prime is 28326635413. The next prime is 28326635459. The reversal of 28326635421 is 12453662382.

It is a happy number.

It is not a de Polignac number, because 28326635421 - 2³ = 28326635413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28326635461) 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, 2977945 + ... + 2987441.

It is an arithmetic number, because the mean of its divisors is an integer number (1358479944).

Almost surely, 2^28326635421 is an apocalyptic number.

28326635421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28326635421 is a deficient number, since it is larger than the sum of its proper divisors (15144722787).

28326635421 is a wasteful number, since it uses less digits than its factorization.

28326635421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501.

The product of its digits is 414720, while the sum is 42.

The spelling of 28326635421 in words is "twenty-eight billion, three hundred twenty-six million, six hundred thirty-five thousand, four hundred twenty-one".