64820387 has 2 divisors, whose sum is σ = 64820388. Its totient is φ = 64820386.

The previous prime is 64820359. The next prime is 64820407. The reversal of 64820387 is 78302846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64820387 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64820387.

It is not a weakly prime, because it can be changed into another prime (64820087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32410193 + 32410194.

It is an arithmetic number, because the mean of its divisors is an integer number (32410194).

Almost surely, 2^64820387 is an apocalyptic number.

64820387 is a deficient number, since it is larger than the sum of its proper divisors (1).

64820387 is an equidigital number, since it uses as much as digits as its factorization.

64820387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 64820387 is about 8051.1109171344. The cubic root of 64820387 is about 401.7018882547.

The spelling of 64820387 in words is "sixty-four million, eight hundred twenty thousand, three hundred eighty-seven".