64723213 has 4 divisors (see below), whose sum is σ = 66228448. Its totient is φ = 63217980.

The previous prime is 64723193. The next prime is 64723237. The reversal of 64723213 is 31232746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31232746 = 2 ⋅15616373.

It is a cyclic number.

It is not a de Polignac number, because 64723213 - 2¹⁷ = 64592141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752553 + ... + 752638.

It is an arithmetic number, because the mean of its divisors is an integer number (16557112).

Almost surely, 2^64723213 is an apocalyptic number.

It is an amenable number.

64723213 is a deficient number, since it is larger than the sum of its proper divisors (1505235).

64723213 is a wasteful number, since it uses less digits than its factorization.

64723213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505234.

The product of its digits is 6048, while the sum is 28.

The square root of 64723213 is about 8045.0738343411. The cubic root of 64723213 is about 401.5010537977.

Adding to 64723213 its reverse (31232746), we get a palindrome (95955959).

The spelling of 64723213 in words is "sixty-four million, seven hundred twenty-three thousand, two hundred thirteen".