64789990 has 8 divisors (see below), whose sum is σ = 116622000. Its totient is φ = 25915992.

The previous prime is 64789961. The next prime is 64789999. The reversal of 64789990 is 9998746.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64789999) 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, 3239490 + ... + 3239509.

It is an arithmetic number, because the mean of its divisors is an integer number (14577750).

Almost surely, 2^64789990 is an apocalyptic number.

64789990 is a deficient number, since it is larger than the sum of its proper divisors (51832010).

64789990 is a wasteful number, since it uses less digits than its factorization.

64789990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6479006.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 64789990 is about 8049.2229438623. Note that the first 3 decimals coincide. The cubic root of 64789990 is about 401.6390868119.

The spelling of 64789990 in words is "sixty-four million, seven hundred eighty-nine thousand, nine hundred ninety".