64730261 has 2 divisors, whose sum is σ = 64730262. Its totient is φ = 64730260.

The previous prime is 64730243. The next prime is 64730269. The reversal of 64730261 is 16203746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 4977361 = 7730^2 + 2231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64730261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64730269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32365130 + 32365131.

It is an arithmetic number, because the mean of its divisors is an integer number (32365131).

Almost surely, 2^64730261 is an apocalyptic number.

It is an amenable number.

64730261 is a deficient number, since it is larger than the sum of its proper divisors (1).

64730261 is an equidigital number, since it uses as much as digits as its factorization.

64730261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 64730261 is about 8045.5118544441. The cubic root of 64730261 is about 401.5156270169.

The spelling of 64730261 in words is "sixty-four million, seven hundred thirty thousand, two hundred sixty-one".