641232638 has 8 divisors (see below), whose sum is σ = 971372520. Its totient is φ = 317441800.

The previous prime is 641232593. The next prime is 641232643. The reversal of 641232638 is 836232146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×641232638² = 822358592072878088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641232598 and 641232607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587008 + ... + 1587411.

It is an arithmetic number, because the mean of its divisors is an integer number (121421565).

Almost surely, 2^641232638 is an apocalyptic number.

641232638 is a deficient number, since it is larger than the sum of its proper divisors (330139882).

641232638 is a wasteful number, since it uses less digits than its factorization.

641232638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174522.

The product of its digits is 41472, while the sum is 35.

The square root of 641232638 is about 25322.5717098402. The cubic root of 641232638 is about 862.3267791320.

The spelling of 641232638 in words is "six hundred forty-one million, two hundred thirty-two thousand, six hundred thirty-eight".