64378091 has 2 divisors, whose sum is σ = 64378092. Its totient is φ = 64378090.

The previous prime is 64378049. The next prime is 64378129. The reversal of 64378091 is 19087346.

It is an a-pointer prime, because the next prime (64378129) can be obtained adding 64378091 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64378091 - 2¹⁰ = 64377067 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (64378001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32189045 + 32189046.

It is an arithmetic number, because the mean of its divisors is an integer number (32189046).

Almost surely, 2^64378091 is an apocalyptic number.

64378091 is a deficient number, since it is larger than the sum of its proper divisors (1).

64378091 is an equidigital number, since it uses as much as digits as its factorization.

64378091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 64378091 is about 8023.5958896246. The cubic root of 64378091 is about 400.7861435171.

The spelling of 64378091 in words is "sixty-four million, three hundred seventy-eight thousand, ninety-one".