28815007643 has 4 divisors (see below), whose sum is σ = 29428092960. Its totient is φ = 28201922328.

The previous prime is 28815007541. The next prime is 28815007657. The reversal of 28815007643 is 34670051882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28815007643 - 2¹⁴ = 28814991259 is a prime.

It is a super-2 number, since 2×28815007643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28815007594 and 28815007603.

It is not an unprimeable number, because it can be changed into a prime (28815007693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 306542588 + ... + 306542681.

It is an arithmetic number, because the mean of its divisors is an integer number (7357023240).

Almost surely, 2^28815007643 is an apocalyptic number.

28815007643 is a deficient number, since it is larger than the sum of its proper divisors (613085317).

28815007643 is an equidigital number, since it uses as much as digits as its factorization.

28815007643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613085316.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 28815007643 in words is "twenty-eight billion, eight hundred fifteen million, seven thousand, six hundred forty-three".