53721375 has 16 divisors (see below), whose sum is σ = 89392992. Its totient is φ = 28651200.

The previous prime is 53721361. The next prime is 53721391. The reversal of 53721375 is 57312735.

It is not a de Polignac number, because 53721375 - 2⁴ = 53721359 is a prime.

It is a super-2 number, since 2×53721375² = 5771972263781250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71254 + ... + 72003.

It is an arithmetic number, because the mean of its divisors is an integer number (5587062).

Almost surely, 2^53721375 is an apocalyptic number.

53721375 is a deficient number, since it is larger than the sum of its proper divisors (35671617).

53721375 is a wasteful number, since it uses less digits than its factorization.

53721375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143275 (or 143265 counting only the distinct ones).

The product of its digits is 22050, while the sum is 33.

The square root of 53721375 is about 7329.4866805255. The cubic root of 53721375 is about 377.3251094037.

It can be divided in two parts, 537 and 21375, that added together give a palindrome (21912).

The spelling of 53721375 in words is "fifty-three million, seven hundred twenty-one thousand, three hundred seventy-five".