641307440 has 20 divisors (see below), whose sum is σ = 1491039984. Its totient is φ = 256522944.

The previous prime is 641307427. The next prime is 641307463. The reversal of 641307440 is 44703146.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×641307440² = 822550465198707200, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4008092 + ... + 4008251.

Almost surely, 2^641307440 is an apocalyptic number.

It is an amenable number.

641307440 is an abundant number, since it is smaller than the sum of its proper divisors (849732544).

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

641307440 is a wasteful number, since it uses less digits than its factorization.

641307440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016356 (or 8016350 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 641307440 is about 25324.0486494557. The cubic root of 641307440 is about 862.3603089598.

The spelling of 641307440 in words is "six hundred forty-one million, three hundred seven thousand, four hundred forty".