64689307 has 8 divisors (see below), whose sum is σ = 65774592. Its totient is φ = 63609000.

The previous prime is 64689299. The next prime is 64689323. The reversal of 64689307 is 70398646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64689307 - 2³ = 64689299 is a prime.

It is a super-3 number, since 3×64689307³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64689337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32182 + ... + 34132.

It is an arithmetic number, because the mean of its divisors is an integer number (8221824).

Almost surely, 2^64689307 is an apocalyptic number.

64689307 is a deficient number, since it is larger than the sum of its proper divisors (1085285).

64689307 is a wasteful number, since it uses less digits than its factorization.

64689307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 64689307 is about 8042.9663060341. The cubic root of 64689307 is about 401.4309312355.

The spelling of 64689307 in words is "sixty-four million, six hundred eighty-nine thousand, three hundred seven".