641544492 has 24 divisors (see below), whose sum is σ = 1507710400. Its totient is φ = 212309136.

The previous prime is 641544479. The next prime is 641544493. The reversal of 641544492 is 294445146.

It is a super-3 number, since 3×641544492³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641544492.

It is not an unprimeable number, because it can be changed into a prime (641544493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190642 + ... + 193977.

Almost surely, 2^641544492 is an apocalyptic number.

It is an amenable number.

641544492 is an abundant number, since it is smaller than the sum of its proper divisors (866165908).

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

641544492 is a wasteful number, since it uses less digits than its factorization.

641544492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384765 (or 384763 counting only the distinct ones).

The product of its digits is 138240, while the sum is 39.

The square root of 641544492 is about 25328.7285902787. The cubic root of 641544492 is about 862.4665497634.

The spelling of 641544492 in words is "six hundred forty-one million, five hundred forty-four thousand, four hundred ninety-two".