64747819 has 2 divisors, whose sum is σ = 64747820. Its totient is φ = 64747818.

The previous prime is 64747703. The next prime is 64747841. The reversal of 64747819 is 91874746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64747819 - 2¹¹ = 64745771 is a prime.

It is a super-2 number, since 2×64747819² = 8384560130513522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64747889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32373909 + 32373910.

It is an arithmetic number, because the mean of its divisors is an integer number (32373910).

Almost surely, 2^64747819 is an apocalyptic number.

64747819 is a deficient number, since it is larger than the sum of its proper divisors (1).

64747819 is an equidigital number, since it uses as much as digits as its factorization.

64747819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 64747819 is about 8046.6029478284. The cubic root of 64747819 is about 401.5519272673.

The spelling of 64747819 in words is "sixty-four million, seven hundred forty-seven thousand, eight hundred nineteen".