64220402 has 16 divisors (see below), whose sum is σ = 98248920. Its totient is φ = 31477248.

The previous prime is 64220369. The next prime is 64220411. The reversal of 64220402 is 20402246.

It can be written as a sum of positive squares in 4 ways, for example, as 63218401 + 1002001 = 7951^2 + 1001^2 .

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 7 ways as a sum of consecutive naturals, for example, 19628 + ... + 22664.

Almost surely, 2^64220402 is an apocalyptic number.

64220402 is a deficient number, since it is larger than the sum of its proper divisors (34028518).

64220402 is a wasteful number, since it uses less digits than its factorization.

64220402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 64220402 is about 8013.7632857478. The cubic root of 64220402 is about 400.4586447448.

Adding to 64220402 its reverse (20402246), we get a palindrome (84622648).

The spelling of 64220402 in words is "sixty-four million, two hundred twenty thousand, four hundred two".