28220536269491 has 16 divisors (see below), whose sum is σ = 29870466232320. Its totient is φ = 26625235127040.

The previous prime is 28220536269451. The next prime is 28220536269521. The reversal of 28220536269491 is 19496263502282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28220536269491 - 2²⁶ = 28220469160627 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28220536269491.

It is not an unprimeable number, because it can be changed into a prime (28220536269421) 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, 69835451 + ... + 70238388.

It is an arithmetic number, because the mean of its divisors is an integer number (1866904139520).

Almost surely, 2^{28220536269491} is an apocalyptic number.

28220536269491 is a deficient number, since it is larger than the sum of its proper divisors (1649929962829).

28220536269491 is a wasteful number, since it uses less digits than its factorization.

28220536269491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140074034.

The product of its (nonzero) digits is 22394880, while the sum is 59.

The spelling of 28220536269491 in words is "twenty-eight trillion, two hundred twenty billion, five hundred thirty-six million, two hundred sixty-nine thousand, four hundred ninety-one".