64400587 has 2 divisors, whose sum is σ = 64400588. Its totient is φ = 64400586.

The previous prime is 64400551. The next prime is 64400593. The reversal of 64400587 is 78500446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64400587 is a prime.

It is not a weakly prime, because it can be changed into another prime (64400087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200293 + 32200294.

It is an arithmetic number, because the mean of its divisors is an integer number (32200294).

Almost surely, 2^64400587 is an apocalyptic number.

64400587 is a deficient number, since it is larger than the sum of its proper divisors (1).

64400587 is an equidigital number, since it uses as much as digits as its factorization.

64400587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 64400587 is about 8024.9976323984. The cubic root of 64400587 is about 400.8328210693.

The spelling of 64400587 in words is "sixty-four million, four hundred thousand, five hundred eighty-seven".