641028817 has 32 divisors (see below), whose sum is σ = 776208384. Its totient is φ = 521640000.

The previous prime is 641028797. The next prime is 641028823. The reversal of 641028817 is 718820146.

It is a cyclic number.

It is not a de Polignac number, because 641028817 - 2¹⁵ = 640996049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641020817) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 853192 + ... + 853942.

It is an arithmetic number, because the mean of its divisors is an integer number (24256512).

Almost surely, 2^641028817 is an apocalyptic number.

It is an amenable number.

641028817 is a deficient number, since it is larger than the sum of its proper divisors (135179567).

641028817 is a wasteful number, since it uses less digits than its factorization.

641028817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 641028817 is about 25318.5468974821. The cubic root of 641028817 is about 862.2354035939.

The spelling of 641028817 in words is "six hundred forty-one million, twenty-eight thousand, eight hundred seventeen".