64220142 has 32 divisors (see below), whose sum is σ = 149916672. Its totient is φ = 17957664.

The previous prime is 64220141. The next prime is 64220147. The reversal of 64220142 is 24102246.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64220141) 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 in 15 ways as a sum of consecutive naturals, for example, 14293 + ... + 18240.

It is an arithmetic number, because the mean of its divisors is an integer number (4684896).

Almost surely, 2^64220142 is an apocalyptic number.

64220142 is an abundant number, since it is smaller than the sum of its proper divisors (85696530).

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

64220142 is a wasteful number, since it uses less digits than its factorization.

64220142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32592.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 64220142 is about 8013.7470636401. The cubic root of 64220142 is about 400.4581043175.

Adding to 64220142 its reverse (24102246), we get a palindrome (88322388).

The spelling of 64220142 in words is "sixty-four million, two hundred twenty thousand, one hundred forty-two".