64467839 has 2 divisors, whose sum is σ = 64467840. Its totient is φ = 64467838.

The previous prime is 64467797. The next prime is 64467847. The reversal of 64467839 is 93876446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64467839 - 2⁸ = 64467583 is a prime.

It is a super-2 number, since 2×64467839² = 8312204530659842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 64467793 and 64467802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64467889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32233919 + 32233920.

It is an arithmetic number, because the mean of its divisors is an integer number (32233920).

Almost surely, 2^64467839 is an apocalyptic number.

64467839 is a deficient number, since it is larger than the sum of its proper divisors (1).

64467839 is an equidigital number, since it uses as much as digits as its factorization.

64467839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 64467839 is about 8029.1866960484. The cubic root of 64467839 is about 400.9722992538.

The spelling of 64467839 in words is "sixty-four million, four hundred sixty-seven thousand, eight hundred thirty-nine".