641779467 has 16 divisors (see below), whose sum is σ = 1004381952. Its totient is φ = 356819040.

The previous prime is 641779459. The next prime is 641779471. The reversal of 641779467 is 764977146.

It is not a de Polignac number, because 641779467 - 2³ = 641779459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641779417) 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, 412209 + ... + 413762.

It is an arithmetic number, because the mean of its divisors is an integer number (62773872).

Almost surely, 2^641779467 is an apocalyptic number.

641779467 is a deficient number, since it is larger than the sum of its proper divisors (362602485).

641779467 is a wasteful number, since it uses less digits than its factorization.

641779467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826018.

The product of its digits is 1778112, while the sum is 51.

The square root of 641779467 is about 25333.3666732237. The cubic root of 641779467 is about 862.5718338827.

It can be divided in two parts, 641779 and 467, that added together give a palindrome (642246).

The spelling of 641779467 in words is "six hundred forty-one million, seven hundred seventy-nine thousand, four hundred sixty-seven".