641297240 has 32 divisors (see below), whose sum is σ = 1448556480. Its totient is φ = 255516672.

The previous prime is 641297221. The next prime is 641297263. The reversal of 641297240 is 42792146.

641297240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641297240² = 822524300063235200, 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 641297240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20912 + ... + 41471.

It is an arithmetic number, because the mean of its divisors is an integer number (45267390).

Almost surely, 2^641297240 is an apocalyptic number.

It is an amenable number.

641297240 is an abundant number, since it is smaller than the sum of its proper divisors (807259240).

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

641297240 is a wasteful number, since it uses less digits than its factorization.

641297240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62651 (or 62647 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 641297240 is about 25323.8472590560. The cubic root of 641297240 is about 862.3557369863.

The spelling of 641297240 in words is "six hundred forty-one million, two hundred ninety-seven thousand, two hundred forty".