53735721 has 32 divisors (see below), whose sum is σ = 79349760. Its totient is φ = 32145984.

The previous prime is 53735701. The next prime is 53735723. The reversal of 53735721 is 12753735.

It is a de Polignac number, because none of the positive numbers 2^k-53735721 is a prime.

It is a super-2 number, since 2×53735721² = 5775055422779682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53735723) 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, 329586 + ... + 329748.

It is an arithmetic number, because the mean of its divisors is an integer number (2479680).

Almost surely, 2^53735721 is an apocalyptic number.

It is an amenable number.

53735721 is a deficient number, since it is larger than the sum of its proper divisors (25614039).

53735721 is a wasteful number, since it uses less digits than its factorization.

53735721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

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

The square root of 53735721 is about 7330.4652649065. The cubic root of 53735721 is about 377.3586939514.

The spelling of 53735721 in words is "fifty-three million, seven hundred thirty-five thousand, seven hundred twenty-one".