638012481 has 32 divisors (see below), whose sum is σ = 884860032. Its totient is φ = 408706560.

The previous prime is 638012477. The next prime is 638012503. The reversal of 638012481 is 184210836.

It is not a de Polignac number, because 638012481 - 2² = 638012477 is a prime.

It is a super-2 number, since 2×638012481² = 814119851823550722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (638012411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2177371 + ... + 2177663.

It is an arithmetic number, because the mean of its divisors is an integer number (27651876).

Almost surely, 2^638012481 is an apocalyptic number.

638012481 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

638012481 is a deficient number, since it is larger than the sum of its proper divisors (246847551).

638012481 is a wasteful number, since it uses less digits than its factorization.

638012481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 638012481 is about 25258.9089431828. The cubic root of 638012481 is about 860.8808718243.

The spelling of 638012481 in words is "six hundred thirty-eight million, twelve thousand, four hundred eighty-one".