54857721 has 8 divisors (see below), whose sum is σ = 73198944. Its totient is φ = 36544160.

The previous prime is 54857707. The next prime is 54857729. The reversal of 54857721 is 12775845.

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

It is a cyclic number.

It is not a de Polignac number, because 54857721 - 2⁵ = 54857689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 54857721.

It is not an unprimeable number, because it can be changed into a prime (54857729) 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, 1731 + ... + 10616.

It is an arithmetic number, because the mean of its divisors is an integer number (9149868).

Almost surely, 2^54857721 is an apocalyptic number.

It is an amenable number.

54857721 is a deficient number, since it is larger than the sum of its proper divisors (18341223).

54857721 is a wasteful number, since it uses less digits than its factorization.

54857721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13831.

The product of its digits is 78400, while the sum is 39.

The square root of 54857721 is about 7406.5998271812. The cubic root of 54857721 is about 379.9670354599.

The spelling of 54857721 in words is "fifty-four million, eight hundred fifty-seven thousand, seven hundred twenty-one".