64747481 has 2 divisors, whose sum is σ = 64747482. Its totient is φ = 64747480.

The previous prime is 64747477. The next prime is 64747489. The reversal of 64747481 is 18474746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42042256 + 22705225 = 6484^2 + 4765^2 .

It is a cyclic number.

It is not a de Polignac number, because 64747481 - 2² = 64747477 is a prime.

It is a super-2 number, since 2×64747481² = 8384472591690722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64747489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32373740 + 32373741.

It is an arithmetic number, because the mean of its divisors is an integer number (32373741).

Almost surely, 2^64747481 is an apocalyptic number.

It is an amenable number.

64747481 is a deficient number, since it is larger than the sum of its proper divisors (1).

64747481 is an equidigital number, since it uses as much as digits as its factorization.

64747481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 41.

The square root of 64747481 is about 8046.5819451491. The cubic root of 64747481 is about 401.5512285319.

The spelling of 64747481 in words is "sixty-four million, seven hundred forty-seven thousand, four hundred eighty-one".