53996721 has 8 divisors (see below), whose sum is σ = 72708864. Its totient is φ = 35641200.

The previous prime is 53996693. The next prime is 53996779. The reversal of 53996721 is 12769935.

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

It is not a de Polignac number, because 53996721 - 2¹¹ = 53994673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53996791) 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, 88801 + ... + 89406.

It is an arithmetic number, because the mean of its divisors is an integer number (9088608).

Almost surely, 2^53996721 is an apocalyptic number.

It is an amenable number.

53996721 is a deficient number, since it is larger than the sum of its proper divisors (18712143).

53996721 is a wasteful number, since it uses less digits than its factorization.

53996721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178311.

The product of its digits is 102060, while the sum is 42.

The square root of 53996721 is about 7348.2461172718. The cubic root of 53996721 is about 377.9686642930.

The spelling of 53996721 in words is "fifty-three million, nine hundred ninety-six thousand, seven hundred twenty-one".