28084331643 has 16 divisors (see below), whose sum is σ = 38139037056. Its totient is φ = 18378233280.

The previous prime is 28084331633. The next prime is 28084331669. The reversal of 28084331643 is 34613348082.

It is not a de Polignac number, because 28084331643 - 2⁶ = 28084331579 is a prime.

It is a super-2 number, since 2×28084331643² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28084331595 and 28084331604.

It is not an unprimeable number, because it can be changed into a prime (28084331633) 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, 189978 + ... + 303743.

It is an arithmetic number, because the mean of its divisors is an integer number (2383689816).

Almost surely, 2^28084331643 is an apocalyptic number.

28084331643 is a deficient number, since it is larger than the sum of its proper divisors (10054705413).

28084331643 is a wasteful number, since it uses less digits than its factorization.

28084331643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494074.

The product of its (nonzero) digits is 331776, while the sum is 42.

The spelling of 28084331643 in words is "twenty-eight billion, eighty-four million, three hundred thirty-one thousand, six hundred forty-three".