57273721 has 8 divisors (see below), whose sum is σ = 58861440. Its totient is φ = 55697712.

The previous prime is 57273691. The next prime is 57273763. The reversal of 57273721 is 12737275.

It is a happy number.

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 57273721 - 2¹¹ = 57271673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57273791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7491 + ... + 13063.

It is an arithmetic number, because the mean of its divisors is an integer number (7357680).

Almost surely, 2^57273721 is an apocalyptic number.

It is an amenable number.

57273721 is a deficient number, since it is larger than the sum of its proper divisors (1587719).

57273721 is a wasteful number, since it uses less digits than its factorization.

57273721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5855.

The product of its digits is 20580, while the sum is 34.

The square root of 57273721 is about 7567.9403406739. The cubic root of 57273721 is about 385.4651621640.

The spelling of 57273721 in words is "fifty-seven million, two hundred seventy-three thousand, seven hundred twenty-one".