641787447 has 24 divisors (see below), whose sum is σ = 1000966512. Its totient is φ = 364694400.

The previous prime is 641787437. The next prime is 641787449. The reversal of 641787447 is 744787146.

It is not a de Polignac number, because 641787447 - 2²⁸ = 373351991 is a prime.

It is a super-2 number, since 2×641787447² = 823782254253555618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641787396 and 641787405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641787449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14547 + ... + 38667.

It is an arithmetic number, because the mean of its divisors is an integer number (41706938).

Almost surely, 2^641787447 is an apocalyptic number.

641787447 is a deficient number, since it is larger than the sum of its proper divisors (359179065).

641787447 is a wasteful number, since it uses less digits than its factorization.

641787447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24319 (or 24312 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 48.

The square root of 641787447 is about 25333.5241725268. The cubic root of 641787447 is about 862.5754089917.

The spelling of 641787447 in words is "six hundred forty-one million, seven hundred eighty-seven thousand, four hundred forty-seven".