64709431 has 8 divisors (see below), whose sum is σ = 66960000. Its totient is φ = 62469120.

The previous prime is 64709417. The next prime is 64709443. The reversal of 64709431 is 13490746.

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 64709431 - 2⁷ = 64709303 is a prime.

It is a super-2 number, since 2×64709431² = 8374620920687522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64709461) 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 7 ways as a sum of consecutive naturals, for example, 11595 + ... + 16243.

It is an arithmetic number, because the mean of its divisors is an integer number (8370000).

Almost surely, 2^64709431 is an apocalyptic number.

64709431 is a deficient number, since it is larger than the sum of its proper divisors (2250569).

64709431 is a wasteful number, since it uses less digits than its factorization.

64709431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 64709431 is about 8044.2172397319. The cubic root of 64709431 is about 401.4725535627.

The spelling of 64709431 in words is "sixty-four million, seven hundred nine thousand, four hundred thirty-one".