5401643638 has 16 divisors (see below), whose sum is σ = 8244826560. Its totient is φ = 2653424136.

The previous prime is 5401643609. The next prime is 5401643641. The reversal of 5401643638 is 8363461045.

It is a self number, because there is not a number n which added to its sum of digits gives 5401643638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193045 + ... + 219247.

It is an arithmetic number, because the mean of its divisors is an integer number (515301660).

Almost surely, 2^5401643638 is an apocalyptic number.

5401643638 is a deficient number, since it is larger than the sum of its proper divisors (2843182922).

5401643638 is a wasteful number, since it uses less digits than its factorization.

5401643638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28011.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 5401643638 is about 73495.8749726813. The cubic root of 5401643638 is about 1754.5886258586.

The spelling of 5401643638 in words is "five billion, four hundred one million, six hundred forty-three thousand, six hundred thirty-eight".