52721669 has 32 divisors (see below), whose sum is σ = 73113600. Its totient is φ = 36676800.

The previous prime is 52721651. The next prime is 52721671. The reversal of 52721669 is 96612725.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52721669 is a prime.

It is a super-3 number, since 3×52721669³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52721069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30182 + ... + 31880.

It is an arithmetic number, because the mean of its divisors is an integer number (2284800).

Almost surely, 2^52721669 is an apocalyptic number.

It is an amenable number.

52721669 is a deficient number, since it is larger than the sum of its proper divisors (20391931).

52721669 is a wasteful number, since it uses less digits than its factorization.

52721669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761.

The product of its digits is 45360, while the sum is 38.

The square root of 52721669 is about 7260.9688747439. The cubic root of 52721669 is about 374.9698796548.

The spelling of 52721669 in words is "fifty-two million, seven hundred twenty-one thousand, six hundred sixty-nine".