64216442 has 4 divisors (see below), whose sum is σ = 96324666. Its totient is φ = 32108220.

The previous prime is 64216433. The next prime is 64216457. The reversal of 64216442 is 24461246.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 64144081 + 72361 = 8009^2 + 269^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16054109 + ... + 16054112.

Almost surely, 2^64216442 is an apocalyptic number.

64216442 is a deficient number, since it is larger than the sum of its proper divisors (32108224).

64216442 is a wasteful number, since it uses less digits than its factorization.

64216442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32108223.

The product of its digits is 9216, while the sum is 29.

The square root of 64216442 is about 8013.5162070093. The cubic root of 64216442 is about 400.4504134622.

Adding to 64216442 its reverse (24461246), we get a palindrome (88677688).

The spelling of 64216442 in words is "sixty-four million, two hundred sixteen thousand, four hundred forty-two".