28018537908516 has 135 divisors (see below), whose sum is σ = 73424079546181. Its totient is φ = 9008864231808.

The previous prime is 28018537908509. The next prime is 28018537908523. The reversal of 28018537908516 is 61580973581082.

The square root of 28018537908516 is 5293254.

It is a perfect power (a square), and thus also a powerful number.

28018537908516 is a `hidden beast` number, since 2 + 8 + 0 + 1 + 8 + 537 + 9 + 0 + 85 + 16 = 666.

It is an interprime number because it is at equal distance from previous prime (28018537908509) and next prime (28018537908523).

It can be written as a sum of positive squares in 7 ways, for example, as 1868814766116 + 26149723142400 = 1367046^2 + 5113680^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 26709759160 + ... + 26709760208.

Almost surely, 2^{28018537908516} is an apocalyptic number.

28018537908516 is the 5293254-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28018537908516

28018537908516 is an abundant number, since it is smaller than the sum of its proper divisors (45405541637665).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28018537908516 is an frugal number, since it uses more digits than its factorization.

28018537908516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2224 (or 1083 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 63.

The spelling of 28018537908516 in words is "twenty-eight trillion, eighteen billion, five hundred thirty-seven million, nine hundred eight thousand, five hundred sixteen".