641801070 has 80 divisors (see below), whose sum is σ = 1729628208. Its totient is φ = 170760960.

The previous prime is 641801033. The next prime is 641801077. The reversal of 641801070 is 70108146.

It is a happy number.

641801070 is a `hidden beast` number, since 641 + 8 + 0 + 10 + 7 + 0 = 666.

It is a super-2 number, since 2×641801070² = 823817226906289800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641801077) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 656422 + ... + 657398.

Almost surely, 2^641801070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641801070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864814104).

641801070 is an abundant number, since it is smaller than the sum of its proper divisors (1087827138).

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

641801070 is a wasteful number, since it uses less digits than its factorization.

641801070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 641801070 is about 25333.7930440745. The cubic root of 641801070 is about 862.5815121451.

The spelling of 641801070 in words is "six hundred forty-one million, eight hundred one thousand, seventy".