54487721 has 4 divisors (see below), whose sum is σ = 55016832. Its totient is φ = 53958612.

The previous prime is 54487681. The next prime is 54487733. The reversal of 54487721 is 12778445.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54487721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (54487921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264401 + ... + 264606.

It is an arithmetic number, because the mean of its divisors is an integer number (13754208).

Almost surely, 2^54487721 is an apocalyptic number.

It is an amenable number.

54487721 is a deficient number, since it is larger than the sum of its proper divisors (529111).

54487721 is a wasteful number, since it uses less digits than its factorization.

54487721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529110.

The product of its digits is 62720, while the sum is 38.

The square root of 54487721 is about 7381.5798444506. The cubic root of 54487721 is about 379.1108504939.

The spelling of 54487721 in words is "fifty-four million, four hundred eighty-seven thousand, seven hundred twenty-one".