64858639 has 2 divisors, whose sum is σ = 64858640. Its totient is φ = 64858638.

The previous prime is 64858627. The next prime is 64858691. The reversal of 64858639 is 93685846.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64858639 - 2⁷ = 64858511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64858592 and 64858601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64858139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32429319 + 32429320.

It is an arithmetic number, because the mean of its divisors is an integer number (32429320).

Almost surely, 2^64858639 is an apocalyptic number.

64858639 is a deficient number, since it is larger than the sum of its proper divisors (1).

64858639 is an equidigital number, since it uses as much as digits as its factorization.

64858639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 64858639 is about 8053.4861395547. The cubic root of 64858639 is about 401.7808905550.

The spelling of 64858639 in words is "sixty-four million, eight hundred fifty-eight thousand, six hundred thirty-nine".