28020821709467 has 4 divisors (see below), whose sum is σ = 28021602030576. Its totient is φ = 28020041388360.

The previous prime is 28020821709443. The next prime is 28020821709499. The reversal of 28020821709467 is 76490712802082.

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 28020821709467 - 2²⁶ = 28020754600603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28020821709367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390106688 + ... + 390178509.

It is an arithmetic number, because the mean of its divisors is an integer number (7005400507644).

Almost surely, 2^{28020821709467} is an apocalyptic number.

28020821709467 is a deficient number, since it is larger than the sum of its proper divisors (780321109).

28020821709467 is an equidigital number, since it uses as much as digits as its factorization.

28020821709467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780321108.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 28020821709467 in words is "twenty-eight trillion, twenty billion, eight hundred twenty-one million, seven hundred nine thousand, four hundred sixty-seven".