64840442 has 8 divisors (see below), whose sum is σ = 97960800. Its totient is φ = 32186844.

The previous prime is 64840441. The next prime is 64840453. The reversal of 64840442 is 24404846.

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

It is a junction number, because it is equal to n+sod(n) for n = 64840399 and 64840408.

It is not an unprimeable number, because it can be changed into a prime (64840441) 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, 116342 + ... + 116897.

It is an arithmetic number, because the mean of its divisors is an integer number (12245100).

Almost surely, 2^64840442 is an apocalyptic number.

64840442 is a deficient number, since it is larger than the sum of its proper divisors (33120358).

64840442 is a wasteful number, since it uses less digits than its factorization.

64840442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233380.

The product of its (nonzero) digits is 24576, while the sum is 32.

The square root of 64840442 is about 8052.3563011084. The cubic root of 64840442 is about 401.7433119541.

The spelling of 64840442 in words is "sixty-four million, eight hundred forty thousand, four hundred forty-two".