64139087 has 2 divisors, whose sum is σ = 64139088. Its totient is φ = 64139086.

The previous prime is 64139083. The next prime is 64139149. The reversal of 64139087 is 78093146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64139087 - 2² = 64139083 is a prime.

It is a super-2 number, since 2×64139087² = 8227644962387138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64139087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64139083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32069543 + 32069544.

It is an arithmetic number, because the mean of its divisors is an integer number (32069544).

Almost surely, 2^64139087 is an apocalyptic number.

64139087 is a deficient number, since it is larger than the sum of its proper divisors (1).

64139087 is an equidigital number, since it uses as much as digits as its factorization.

64139087 is an odious number, because the sum of its binary digits is odd.

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

The square root of 64139087 is about 8008.6882196774. The cubic root of 64139087 is about 400.2895549276.

The spelling of 64139087 in words is "sixty-four million, one hundred thirty-nine thousand, eighty-seven".