64062781 has 2 divisors, whose sum is σ = 64062782. Its totient is φ = 64062780.

The previous prime is 64062773. The next prime is 64062809. The reversal of 64062781 is 18726046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50623225 + 13439556 = 7115^2 + 3666^2 .

It is a cyclic number.

It is not a de Polignac number, because 64062781 - 2³ = 64062773 is a prime.

It is a super-2 number, since 2×64062781² = 8208079818907922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64062701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32031390 + 32031391.

It is an arithmetic number, because the mean of its divisors is an integer number (32031391).

Almost surely, 2^64062781 is an apocalyptic number.

It is an amenable number.

64062781 is a deficient number, since it is larger than the sum of its proper divisors (1).

64062781 is an equidigital number, since it uses as much as digits as its factorization.

64062781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 64062781 is about 8003.9228507026. The cubic root of 64062781 is about 400.1307510058.

The spelling of 64062781 in words is "sixty-four million, sixty-two thousand, seven hundred eighty-one".