64821607 has 2 divisors, whose sum is σ = 64821608. Its totient is φ = 64821606.

The previous prime is 64821599. The next prime is 64821611. The reversal of 64821607 is 70612846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64821607 - 2³ = 64821599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64821667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32410803 + 32410804.

It is an arithmetic number, because the mean of its divisors is an integer number (32410804).

Almost surely, 2^64821607 is an apocalyptic number.

64821607 is a deficient number, since it is larger than the sum of its proper divisors (1).

64821607 is an equidigital number, since it uses as much as digits as its factorization.

64821607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 64821607 is about 8051.1866827195. The cubic root of 64821607 is about 401.7044084146.

The spelling of 64821607 in words is "sixty-four million, eight hundred twenty-one thousand, six hundred seven".