53721865 has 8 divisors (see below), whose sum is σ = 64533888. Its totient is φ = 42932400.

The previous prime is 53721851. The next prime is 53721901. The reversal of 53721865 is 56812735.

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

It is not a de Polignac number, because 53721865 - 2¹¹ = 53719817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144 + ... + 10366.

It is an arithmetic number, because the mean of its divisors is an integer number (8066736).

Almost surely, 2^53721865 is an apocalyptic number.

It is an amenable number.

53721865 is a deficient number, since it is larger than the sum of its proper divisors (10812023).

53721865 is a wasteful number, since it uses less digits than its factorization.

53721865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11279.

The product of its digits is 50400, while the sum is 37.

The square root of 53721865 is about 7329.5201070739. The cubic root of 53721865 is about 377.3262566115.

The spelling of 53721865 in words is "fifty-three million, seven hundred twenty-one thousand, eight hundred sixty-five".