64689700 has 18 divisors (see below), whose sum is σ = 140376866. Its totient is φ = 25875840.

The previous prime is 64689689. The next prime is 64689701. The reversal of 64689700 is 798646.

64689700 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1582564 + 63107136 = 1258^2 + 7944^2 .

It is not an unprimeable number, because it can be changed into a prime (64689701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 323349 + ... + 323548.

Almost surely, 2^64689700 is an apocalyptic number.

It is an amenable number.

64689700 is an abundant number, since it is smaller than the sum of its proper divisors (75687166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64689700 is a wasteful number, since it uses less digits than its factorization.

64689700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646911 (or 646904 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 64689700 is about 8042.9907372817. The cubic root of 64689700 is about 401.4317441573.

The spelling of 64689700 in words is "sixty-four million, six hundred eighty-nine thousand, seven hundred".