64977823 has 2 divisors, whose sum is σ = 64977824. Its totient is φ = 64977822.

The previous prime is 64977799. The next prime is 64977827. The reversal of 64977823 is 32877946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64977823 - 2²⁵ = 31423391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64977827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32488911 + 32488912.

It is an arithmetic number, because the mean of its divisors is an integer number (32488912).

Almost surely, 2^64977823 is an apocalyptic number.

64977823 is a deficient number, since it is larger than the sum of its proper divisors (1).

64977823 is an equidigital number, since it uses as much as digits as its factorization.

64977823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The square root of 64977823 is about 8060.8822718112. The cubic root of 64977823 is about 402.0268436651.

The spelling of 64977823 in words is "sixty-four million, nine hundred seventy-seven thousand, eight hundred twenty-three".