64531439 has 8 divisors (see below), whose sum is σ = 78088608. Its totient is φ = 52058880.

The previous prime is 64531361. The next prime is 64531471. The reversal of 64531439 is 93413546.

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 a de Polignac number, because none of the positive numbers 2^k-64531439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64531399 and 64531408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64531039) 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, 271022 + ... + 271259.

It is an arithmetic number, because the mean of its divisors is an integer number (9761076).

Almost surely, 2^64531439 is an apocalyptic number.

64531439 is a deficient number, since it is larger than the sum of its proper divisors (13557169).

64531439 is a wasteful number, since it uses less digits than its factorization.

64531439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542305.

The product of its digits is 38880, while the sum is 35.

The square root of 64531439 is about 8033.1462702978. The cubic root of 64531439 is about 401.1041141093.

The spelling of 64531439 in words is "sixty-four million, five hundred thirty-one thousand, four hundred thirty-nine".