64238709 has 8 divisors (see below), whose sum is σ = 85829440. Its totient is φ = 42736896.

The previous prime is 64238693. The next prime is 64238717. The reversal of 64238709 is 90783246.

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

It is not a de Polignac number, because 64238709 - 2⁴ = 64238693 is a prime.

It is a super-2 number, since 2×64238709² = 8253223467973362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64238749) 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, 20524 + ... + 23445.

It is an arithmetic number, because the mean of its divisors is an integer number (10728680).

Almost surely, 2^64238709 is an apocalyptic number.

It is an amenable number.

64238709 is a deficient number, since it is larger than the sum of its proper divisors (21590731).

64238709 is a wasteful number, since it uses less digits than its factorization.

64238709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44459.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 64238709 is about 8014.9054267658. The cubic root of 64238709 is about 400.4966934005.

The spelling of 64238709 in words is "sixty-four million, two hundred thirty-eight thousand, seven hundred nine".