641729392 has 10 divisors (see below), whose sum is σ = 1243350728. Its totient is φ = 320864688.

The previous prime is 641729383. The next prime is 641729393. The reversal of 641729392 is 293927146.

It is a super-2 number, since 2×641729392² = 823633225113379328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641729393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20054028 + ... + 20054059.

Almost surely, 2^641729392 is an apocalyptic number.

It is an amenable number.

641729392 is a deficient number, since it is larger than the sum of its proper divisors (601621336).

641729392 is a wasteful number, since it uses less digits than its factorization.

641729392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40108095 (or 40108089 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 641729392 is about 25332.3783328767. The cubic root of 641729392 is about 862.5493991730.

The spelling of 641729392 in words is "six hundred forty-one million, seven hundred twenty-nine thousand, three hundred ninety-two".