537640865 has 8 divisors (see below), whose sum is σ = 651088680. Its totient is φ = 426166272.

The previous prime is 537640841. The next prime is 537640879. The reversal of 537640865 is 568046735.

It can be written as a sum of positive squares in 4 ways, for example, as 29408929 + 508231936 = 5423^2 + 22544^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-537640865 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492704 + ... + 493793.

It is an arithmetic number, because the mean of its divisors is an integer number (81386085).

Almost surely, 2^537640865 is an apocalyptic number.

It is an amenable number.

537640865 is a deficient number, since it is larger than the sum of its proper divisors (113447815).

537640865 is a wasteful number, since it uses less digits than its factorization.

537640865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986611.

The product of its (nonzero) digits is 604800, while the sum is 44.

The square root of 537640865 is about 23187.0840124411. The cubic root of 537640865 is about 813.1376876269.

The spelling of 537640865 in words is "five hundred thirty-seven million, six hundred forty thousand, eight hundred sixty-five".