64120817 has 2 divisors, whose sum is σ = 64120818. Its totient is φ = 64120816.

The previous prime is 64120799. The next prime is 64120871. The reversal of 64120817 is 71802146.

Together with next prime (64120871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40462321 + 23658496 = 6361^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 64120817 - 2¹⁶ = 64055281 is a prime.

It is a super-2 number, since 2×64120817² = 8222958345494978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64120817.

It is not a weakly prime, because it can be changed into another prime (64120717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32060408 + 32060409.

It is an arithmetic number, because the mean of its divisors is an integer number (32060409).

Almost surely, 2^64120817 is an apocalyptic number.

It is an amenable number.

64120817 is a deficient number, since it is larger than the sum of its proper divisors (1).

64120817 is an equidigital number, since it uses as much as digits as its factorization.

64120817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 64120817 is about 8007.5475022007. The cubic root of 64120817 is about 400.2515438644.

The spelling of 64120817 in words is "sixty-four million, one hundred twenty thousand, eight hundred seventeen".