64804381 has 2 divisors, whose sum is σ = 64804382. Its totient is φ = 64804380.

The previous prime is 64804379. The next prime is 64804393. The reversal of 64804381 is 18340846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49477156 + 15327225 = 7034^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 64804381 - 2¹ = 64804379 is a prime.

It is a super-2 number, since 2×64804381² = 8399215593586322, which contains 22 as substring.

Together with 64804379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64804301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32402190 + 32402191.

It is an arithmetic number, because the mean of its divisors is an integer number (32402191).

Almost surely, 2^64804381 is an apocalyptic number.

It is an amenable number.

64804381 is a deficient number, since it is larger than the sum of its proper divisors (1).

64804381 is an equidigital number, since it uses as much as digits as its factorization.

64804381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 64804381 is about 8050.1168314503. The cubic root of 64804381 is about 401.6688216532.

The spelling of 64804381 in words is "sixty-four million, eight hundred four thousand, three hundred eighty-one".