64638458 has 8 divisors (see below), whose sum is σ = 97450452. Its totient is φ = 32154976.

The previous prime is 64638449. The next prime is 64638461. The reversal of 64638458 is 85483646.

It can be written as a sum of positive squares in 2 ways, for example, as 41434969 + 23203489 = 6437^2 + 4817^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 81635 + ... + 82422.

Almost surely, 2^64638458 is an apocalyptic number.

64638458 is a deficient number, since it is larger than the sum of its proper divisors (32811994).

64638458 is a wasteful number, since it uses less digits than its factorization.

64638458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164256.

The product of its digits is 552960, while the sum is 44.

The square root of 64638458 is about 8039.8045996156. The cubic root of 64638458 is about 401.3257221312.

The spelling of 64638458 in words is "sixty-four million, six hundred thirty-eight thousand, four hundred fifty-eight".