64971439 has 8 divisors (see below), whose sum is σ = 70033712. Its totient is φ = 59918400.

The previous prime is 64971421. The next prime is 64971457. The reversal of 64971439 is 93417946.

It is an interprime number because it is at equal distance from previous prime (64971421) and next prime (64971457).

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 64971439 - 2⁵ = 64971407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64971395 and 64971404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64971479) 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, 21364 + ... + 24214.

It is an arithmetic number, because the mean of its divisors is an integer number (8754214).

Almost surely, 2^64971439 is an apocalyptic number.

64971439 is a deficient number, since it is larger than the sum of its proper divisors (5062273).

64971439 is a wasteful number, since it uses less digits than its factorization.

64971439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4617.

The product of its digits is 163296, while the sum is 43.

The square root of 64971439 is about 8060.4862756536. The cubic root of 64971439 is about 402.0136770014.

The spelling of 64971439 in words is "sixty-four million, nine hundred seventy-one thousand, four hundred thirty-nine".