8537407281 has 12 divisors (see below), whose sum is σ = 13280411508. Its totient is φ = 5253789024.

The previous prime is 8537407279. The next prime is 8537407297. The reversal of 8537407281 is 1827047358.

8537407281 is a `hidden beast` number, since 8 + 537 + 40 + 72 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2860538256 + 5676869025 = 53484^2 + 75345^2 .

It is not a de Polignac number, because 8537407281 - 2¹ = 8537407279 is a prime.

It is a super-2 number, since 2×8537407281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8537407211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36484530 + ... + 36484763.

It is an arithmetic number, because the mean of its divisors is an integer number (1106700959).

Almost surely, 2^8537407281 is an apocalyptic number.

It is an amenable number.

8537407281 is a deficient number, since it is larger than the sum of its proper divisors (4743004227).

8537407281 is a wasteful number, since it uses less digits than its factorization.

8537407281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72969312 (or 72969309 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 8537407281 is about 92398.0913276892. The cubic root of 8537407281 is about 2043.8169663662.

The spelling of 8537407281 in words is "eight billion, five hundred thirty-seven million, four hundred seven thousand, two hundred eighty-one".