641640454 has 16 divisors (see below), whose sum is σ = 1184567328. Its totient is φ = 253835712.

The previous prime is 641640451. The next prime is 641640463. The reversal of 641640454 is 454046146.

It is a super-2 number, since 2×641640454² = 823404944418652232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641640451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1762567 + ... + 1762930.

It is an arithmetic number, because the mean of its divisors is an integer number (74035458).

Almost surely, 2^641640454 is an apocalyptic number.

641640454 is a deficient number, since it is larger than the sum of its proper divisors (542926874).

641640454 is a wasteful number, since it uses less digits than its factorization.

641640454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525519.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 641640454 is about 25330.6228506131. The cubic root of 641640454 is about 862.5095501008.

The spelling of 641640454 in words is "six hundred forty-one million, six hundred forty thousand, four hundred fifty-four".