64809842 has 8 divisors (see below), whose sum is σ = 97547436. Its totient is φ = 32294032.

The previous prime is 64809841. The next prime is 64809847. The reversal of 64809842 is 24890846.

It can be written as a sum of positive squares in 2 ways, for example, as 55815841 + 8994001 = 7471^2 + 2999^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 64809842.

It is not an unprimeable number, because it can be changed into a prime (64809841) by changing a digit.

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, 54713 + ... + 55884.

Almost surely, 2^64809842 is an apocalyptic number.

64809842 is a deficient number, since it is larger than the sum of its proper divisors (32737594).

64809842 is a wasteful number, since it uses less digits than its factorization.

64809842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110892.

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 64809842 is about 8050.4560119288. The cubic root of 64809842 is about 401.6801040788.

The spelling of 64809842 in words is "sixty-four million, eight hundred nine thousand, eight hundred forty-two".