53582721 has 4 divisors (see below), whose sum is σ = 71443632. Its totient is φ = 35721812.

The previous prime is 53582713. The next prime is 53582723. The reversal of 53582721 is 12728535.

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 53582721 - 2³ = 53582713 is a prime.

It is a super-2 number, since 2×53582721² = 5742215979527682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53582723) 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, 8930451 + ... + 8930456.

It is an arithmetic number, because the mean of its divisors is an integer number (17860908).

Almost surely, 2^53582721 is an apocalyptic number.

It is an amenable number.

53582721 is a deficient number, since it is larger than the sum of its proper divisors (17860911).

53582721 is a wasteful number, since it uses less digits than its factorization.

53582721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17860910.

The product of its digits is 16800, while the sum is 33.

The square root of 53582721 is about 7320.0219261967. The cubic root of 53582721 is about 377.0002063852. Note that the first 3 decimals are identical.

The spelling of 53582721 in words is "fifty-three million, five hundred eighty-two thousand, seven hundred twenty-one".