641624544 has 96 divisors (see below), whose sum is σ = 2041562880. Its totient is φ = 194428800.

The previous prime is 641624497. The next prime is 641624549. The reversal of 641624544 is 445426146.

641624544 is a `hidden beast` number, since 641 + 6 + 2 + 4 + 5 + 4 + 4 = 666.

641624544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-3 number, since 3×641624544³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 641624499 and 641624508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641624549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24252 + ... + 43259.

It is an arithmetic number, because the mean of its divisors is an integer number (21266280).

Almost surely, 2^641624544 is an apocalyptic number.

It is an amenable number.

641624544 is an abundant number, since it is smaller than the sum of its proper divisors (1399938336).

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

641624544 is a wasteful number, since it uses less digits than its factorization.

641624544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67541 (or 67527 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 641624544 is about 25330.3088019076. The cubic root of 641624544 is about 862.5024211652.

The spelling of 641624544 in words is "six hundred forty-one million, six hundred twenty-four thousand, five hundred forty-four".