64279447 has 2 divisors, whose sum is σ = 64279448. Its totient is φ = 64279446.

The previous prime is 64279427. The next prime is 64279477. The reversal of 64279447 is 74497246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64279447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64279427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32139723 + 32139724.

It is an arithmetic number, because the mean of its divisors is an integer number (32139724).

Almost surely, 2^64279447 is an apocalyptic number.

64279447 is a deficient number, since it is larger than the sum of its proper divisors (1).

64279447 is an equidigital number, since it uses as much as digits as its factorization.

64279447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 43.

The square root of 64279447 is about 8017.4464139151. The cubic root of 64279447 is about 400.5813359619.

It can be divided in two parts, 642 and 79447, that added together give a square (80089 = 283²).

The spelling of 64279447 in words is "sixty-four million, two hundred seventy-nine thousand, four hundred forty-seven".