53733721 has 8 divisors (see below), whose sum is σ = 54462600. Its totient is φ = 53010048.

The previous prime is 53733707. The next prime is 53733769. The reversal of 53733721 is 12733735.

It can be written as a sum of positive squares in 4 ways, for example, as 151321 + 53582400 = 389^2 + 7320^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53733721 - 2⁵ = 53733689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53733521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22245 + ... + 24541.

It is an arithmetic number, because the mean of its divisors is an integer number (6807825).

Almost surely, 2^53733721 is an apocalyptic number.

It is an amenable number.

53733721 is a deficient number, since it is larger than the sum of its proper divisors (728879).

53733721 is a wasteful number, since it uses less digits than its factorization.

53733721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603.

The product of its digits is 13230, while the sum is 31.

The square root of 53733721 is about 7330.3288466480. The cubic root of 53733721 is about 377.3540122317.

The spelling of 53733721 in words is "fifty-three million, seven hundred thirty-three thousand, seven hundred twenty-one".