641830490 has 32 divisors (see below), whose sum is σ = 1356027264. Its totient is φ = 214107840.

The previous prime is 641830489. The next prime is 641830493. The reversal of 641830490 is 94038146.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 641830490.

It is not an unprimeable number, because it can be changed into a prime (641830493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121316 + ... + 126495.

It is an arithmetic number, because the mean of its divisors is an integer number (42375852).

Almost surely, 2^641830490 is an apocalyptic number.

641830490 is an abundant number, since it is smaller than the sum of its proper divisors (714196774).

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

641830490 is a wasteful number, since it uses less digits than its factorization.

641830490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247862.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 641830490 is about 25334.3736847786. The cubic root of 641830490 is about 862.5946921170.

The spelling of 641830490 in words is "six hundred forty-one million, eight hundred thirty thousand, four hundred ninety".