64784081 has 2 divisors, whose sum is σ = 64784082. Its totient is φ = 64784080.

The previous prime is 64784039. The next prime is 64784107. The reversal of 64784081 is 18048746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64144081 + 640000 = 8009^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 64784081 - 2¹⁴ = 64767697 is a prime.

It is a super-2 number, since 2×64784081² = 8393954302029122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64784011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32392040 + 32392041.

It is an arithmetic number, because the mean of its divisors is an integer number (32392041).

Almost surely, 2^64784081 is an apocalyptic number.

It is an amenable number.

64784081 is a deficient number, since it is larger than the sum of its proper divisors (1).

64784081 is an equidigital number, since it uses as much as digits as its factorization.

64784081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 64784081 is about 8048.8558814281. The cubic root of 64784081 is about 401.6268762965.

The spelling of 64784081 in words is "sixty-four million, seven hundred eighty-four thousand, eighty-one".