64689739 has 8 divisors (see below), whose sum is σ = 66037680. Its totient is φ = 63355776.

The previous prime is 64689701. The next prime is 64689761. The reversal of 64689739 is 93798646.

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 64689739 - 2¹⁵ = 64656971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64689139) 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, 6127 + ... + 12919.

It is an arithmetic number, because the mean of its divisors is an integer number (8254710).

Almost surely, 2^64689739 is an apocalyptic number.

64689739 is a deficient number, since it is larger than the sum of its proper divisors (1347941).

64689739 is a wasteful number, since it uses less digits than its factorization.

64689739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6989.

The product of its digits is 1959552, while the sum is 52.

The square root of 64689739 is about 8042.9931617527. The cubic root of 64689739 is about 401.4318248287.

The spelling of 64689739 in words is "sixty-four million, six hundred eighty-nine thousand, seven hundred thirty-nine".