641720475 has 144 divisors (see below), whose sum is σ = 1325297120. Its totient is φ = 307929600.

The previous prime is 641720461. The next prime is 641720531. The reversal of 641720475 is 574027146.

641720475 is a `hidden beast` number, since 641 + 7 + 2 + 0 + 4 + 7 + 5 = 666.

It is not a de Polignac number, because 641720475 - 2¹⁶ = 641654939 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 6615627 + ... + 6615723.

Almost surely, 2^641720475 is an apocalyptic number.

641720475 is an abundant number, since it is smaller than the sum of its proper divisors (683576645).

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

641720475 is an equidigital number, since it uses as much as digits as its factorization.

641720475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 641720475 is about 25332.2023322095. The cubic root of 641720475 is about 862.5454040370.

The spelling of 641720475 in words is "six hundred forty-one million, seven hundred twenty thousand, four hundred seventy-five".