64047761 has 2 divisors, whose sum is σ = 64047762. Its totient is φ = 64047760.

The previous prime is 64047757. The next prime is 64047817. The reversal of 64047761 is 16774046.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46036225 + 18011536 = 6785^2 + 4244^2 .

It is a cyclic number.

It is not a de Polignac number, because 64047761 - 2² = 64047757 is a prime.

It is a super-2 number, since 2×64047761² = 8204231378226242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64047661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32023880 + 32023881.

It is an arithmetic number, because the mean of its divisors is an integer number (32023881).

Almost surely, 2^64047761 is an apocalyptic number.

It is an amenable number.

64047761 is a deficient number, since it is larger than the sum of its proper divisors (1).

64047761 is an equidigital number, since it uses as much as digits as its factorization.

64047761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 64047761 is about 8002.9845057953. The cubic root of 64047761 is about 400.0994773419.

The spelling of 64047761 in words is "sixty-four million, forty-seven thousand, seven hundred sixty-one".