641530285 has 32 divisors (see below), whose sum is σ = 864535680. Its totient is φ = 453024000.

The previous prime is 641530277. The next prime is 641530297. The reversal of 641530285 is 582035146.

It is not a de Polignac number, because 641530285 - 2³ = 641530277 is a prime.

It is a super-2 number, since 2×641530285² = 823122213144362450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641530285.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 293326 + ... + 295504.

It is an arithmetic number, because the mean of its divisors is an integer number (27016740).

Almost surely, 2^641530285 is an apocalyptic number.

It is an amenable number.

641530285 is a deficient number, since it is larger than the sum of its proper divisors (223005395).

641530285 is a wasteful number, since it uses less digits than its factorization.

641530285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 641530285 is about 25328.4481364335. The cubic root of 641530285 is about 862.4601832771.

The spelling of 641530285 in words is "six hundred forty-one million, five hundred thirty thousand, two hundred eighty-five".