28100061537409 has 16 divisors (see below), whose sum is σ = 29383575526800. Its totient is φ = 26838329446656.

The previous prime is 28100061537403. The next prime is 28100061537487. The reversal of 28100061537409 is 90473516000182.

It can be written as a sum of positive squares in 8 ways, for example, as 3855614999184 + 24244446538225 = 1963572^2 + 4923865^2 .

It is a cyclic number.

It is not a de Polignac number, because 28100061537409 - 2⁷ = 28100061537281 is a prime.

It is a super-2 number, since 2×28100061537409² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28100061537403) 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, 5313214 + ... + 9188599.

It is an arithmetic number, because the mean of its divisors is an integer number (1836473470425).

It is a 1-persistent number, because it is pandigital, but 2⋅28100061537409 = 56200123074818 is not.

Almost surely, 2^{28100061537409} is an apocalyptic number.

28100061537409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28100061537409 is a deficient number, since it is larger than the sum of its proper divisors (1283513989391).

28100061537409 is a wasteful number, since it uses less digits than its factorization.

28100061537409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14502564.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 28100061537409 in words is "twenty-eight trillion, one hundred billion, sixty-one million, five hundred thirty-seven thousand, four hundred nine".