28507610247421 has 8 divisors (see below), whose sum is σ = 29298517577784. Its totient is φ = 27717778252800.

The previous prime is 28507610247373. The next prime is 28507610247497. The reversal of 28507610247421 is 12474201670582.

It can be written as a sum of positive squares in 4 ways, for example, as 13153641972025 + 15353968275396 = 3626795^2 + 3918414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28507610247421 - 2¹⁹ = 28507609723133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28507610247521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268780180 + ... + 268886221.

It is an arithmetic number, because the mean of its divisors is an integer number (3662314697223).

Almost surely, 2^{28507610247421} is an apocalyptic number.

It is an amenable number.

28507610247421 is a deficient number, since it is larger than the sum of its proper divisors (790907330363).

28507610247421 is a wasteful number, since it uses less digits than its factorization.

28507610247421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537667871.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 28507610247421 in words is "twenty-eight trillion, five hundred seven billion, six hundred ten million, two hundred forty-seven thousand, four hundred twenty-one".