64721269 has 4 divisors (see below), whose sum is σ = 65118496. Its totient is φ = 64324044.

The previous prime is 64721249. The next prime is 64721281. The reversal of 64721269 is 96212746.

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.

It is a cyclic number.

It is not a de Polignac number, because 64721269 - 2⁷ = 64721141 is a prime.

It is a super-2 number, since 2×64721269² = 8377685321940722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64721249) 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, 198369 + ... + 198694.

It is an arithmetic number, because the mean of its divisors is an integer number (16279624).

Almost surely, 2^64721269 is an apocalyptic number.

It is an amenable number.

64721269 is a deficient number, since it is larger than the sum of its proper divisors (397227).

64721269 is a wasteful number, since it uses less digits than its factorization.

64721269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397226.

The product of its digits is 36288, while the sum is 37.

The square root of 64721269 is about 8044.9530141574. The cubic root of 64721269 is about 401.4970339835.

The spelling of 64721269 in words is "sixty-four million, seven hundred twenty-one thousand, two hundred sixty-nine".