52643721 has 16 divisors (see below), whose sum is σ = 76023360. Its totient is φ = 32210880.

The previous prime is 52643693. The next prime is 52643761. The reversal of 52643721 is 12734625.

It is not a de Polignac number, because 52643721 - 2¹⁰ = 52642697 is a prime.

It is a super-2 number, since 2×52643721² = 5542722721451682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (52643761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3211 + ... + 10751.

It is an arithmetic number, because the mean of its divisors is an integer number (4751460).

Almost surely, 2^52643721 is an apocalyptic number.

It is an amenable number.

52643721 is a deficient number, since it is larger than the sum of its proper divisors (23379639).

52643721 is a wasteful number, since it uses less digits than its factorization.

52643721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7736.

The product of its digits is 10080, while the sum is 30.

The square root of 52643721 is about 7255.5992860687. The cubic root of 52643721 is about 374.7849931935.

The spelling of 52643721 in words is "fifty-two million, six hundred forty-three thousand, seven hundred twenty-one".