64445987 has 2 divisors, whose sum is σ = 64445988. Its totient is φ = 64445986.

The previous prime is 64445939. The next prime is 64445999. The reversal of 64445987 is 78954446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64445987 is a prime.

It is not a weakly prime, because it can be changed into another prime (64445387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32222993 + 32222994.

It is an arithmetic number, because the mean of its divisors is an integer number (32222994).

Almost surely, 2^64445987 is an apocalyptic number.

64445987 is a deficient number, since it is larger than the sum of its proper divisors (1).

64445987 is an equidigital number, since it uses as much as digits as its factorization.

64445987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 47.

The square root of 64445987 is about 8027.8257953197. The cubic root of 64445987 is about 400.9269896493.

The spelling of 64445987 in words is "sixty-four million, four hundred forty-five thousand, nine hundred eighty-seven".