64220723 has 6 divisors (see below), whose sum is σ = 74705796. Its totient is φ = 55046292.

The previous prime is 64220711. The next prime is 64220731. The reversal of 64220723 is 32702246.

It is not a de Polignac number, because 64220723 - 2⁸ = 64220467 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64220692 and 64220701.

It is not an unprimeable number, because it can be changed into a prime (64220743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 655265 + ... + 655362.

It is an arithmetic number, because the mean of its divisors is an integer number (12450966).

Almost surely, 2^64220723 is an apocalyptic number.

64220723 is a deficient number, since it is larger than the sum of its proper divisors (10485073).

64220723 is a wasteful number, since it uses less digits than its factorization.

64220723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310641 (or 1310634 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 64220723 is about 8013.7833137664. The cubic root of 64220723 is about 400.4593119628.

Adding to 64220723 its reverse (32702246), we get a palindrome (96922969).

The spelling of 64220723 in words is "sixty-four million, two hundred twenty thousand, seven hundred twenty-three".