641390498 has 12 divisors (see below), whose sum is σ = 1119161142. Its totient is φ = 274881600.

The previous prime is 641390441. The next prime is 641390509. The reversal of 641390498 is 894093146.

It can be written as a sum of positive squares in only one way, i.e., 624850009 + 16540489 = 24997^2 + 4067^2 .

It is a super-2 number, since 2×641390498² = 822763541849376008, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3272303 + ... + 3272498.

Almost surely, 2^641390498 is an apocalyptic number.

641390498 is a deficient number, since it is larger than the sum of its proper divisors (477770644).

641390498 is a wasteful number, since it uses less digits than its factorization.

641390498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544817 (or 6544810 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 641390498 is about 25325.6885000191. The cubic root of 641390498 is about 862.3975364662.

The spelling of 641390498 in words is "six hundred forty-one million, three hundred ninety thousand, four hundred ninety-eight".