64220638 has 4 divisors (see below), whose sum is σ = 96330960. Its totient is φ = 32110318.

The previous prime is 64220633. The next prime is 64220647. The reversal of 64220638 is 83602246.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64220633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16055158 + ... + 16055161.

It is an arithmetic number, because the mean of its divisors is an integer number (24082740).

Almost surely, 2^64220638 is an apocalyptic number.

64220638 is a deficient number, since it is larger than the sum of its proper divisors (32110322).

64220638 is a wasteful number, since it uses less digits than its factorization.

64220638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32110321.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 64220638 is about 8013.7780104018. The cubic root of 64220638 is about 400.4591352853.

The spelling of 64220638 in words is "sixty-four million, two hundred twenty thousand, six hundred thirty-eight".