641937867 has 16 divisors (see below), whose sum is σ = 907961472. Its totient is φ = 402030720.

The previous prime is 641937839. The next prime is 641937869. The reversal of 641937867 is 768739146.

It is a de Polignac number, because none of the positive numbers 2^k-641937867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (641937869) 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, 16392 + ... + 39402.

It is an arithmetic number, because the mean of its divisors is an integer number (56747592).

Almost surely, 2^641937867 is an apocalyptic number.

641937867 is a deficient number, since it is larger than the sum of its proper divisors (266023605).

641937867 is a wasteful number, since it uses less digits than its factorization.

641937867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23578.

The product of its digits is 1524096, while the sum is 51.

The square root of 641937867 is about 25336.4927920184. The cubic root of 641937867 is about 862.6427929095.

The spelling of 641937867 in words is "six hundred forty-one million, nine hundred thirty-seven thousand, eight hundred sixty-seven".