64721343 has 4 divisors (see below), whose sum is σ = 86295128. Its totient is φ = 43147560.

The previous prime is 64721341. The next prime is 64721357. The reversal of 64721343 is 34312746.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64721343 - 2¹ = 64721341 is a prime.

It is a super-5 number, since 5×64721343⁵ (a number of 40 digits) contains 55555 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64721343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64721341) 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, 10786888 + ... + 10786893.

It is an arithmetic number, because the mean of its divisors is an integer number (21573782).

Almost surely, 2^64721343 is an apocalyptic number.

64721343 is a deficient number, since it is larger than the sum of its proper divisors (21573785).

64721343 is a wasteful number, since it uses less digits than its factorization.

64721343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21573784.

The product of its digits is 12096, while the sum is 30.

The square root of 64721343 is about 8044.9576133128. The cubic root of 64721343 is about 401.4971870026.

The spelling of 64721343 in words is "sixty-four million, seven hundred twenty-one thousand, three hundred forty-three".