639424554 has 16 divisors (see below), whose sum is σ = 1279855200. Its totient is φ = 212973840.

The previous prime is 639424549. The next prime is 639424559. The reversal of 639424554 is 455424936.

It is an interprime number because it is at equal distance from previous prime (639424549) and next prime (639424559).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639424559) 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, 33529 + ... + 49020.

It is an arithmetic number, because the mean of its divisors is an integer number (79990950).

Almost surely, 2^639424554 is an apocalyptic number.

639424554 is an abundant number, since it is smaller than the sum of its proper divisors (640430646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639424554 is a wasteful number, since it uses less digits than its factorization.

639424554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83845.

The product of its digits is 518400, while the sum is 42.

The square root of 639424554 is about 25286.8454734868. The cubic root of 639424554 is about 861.5155150584.

The spelling of 639424554 in words is "six hundred thirty-nine million, four hundred twenty-four thousand, five hundred fifty-four".