57720366 has 96 divisors (see below), whose sum is σ = 146390400. Its totient is φ = 16251840.

The previous prime is 57720361. The next prime is 57720367. The reversal of 57720366 is 66302775.

It is a happy number.

57720366 is a `hidden beast` number, since 577 + 20 + 3 + 66 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 57720366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57720361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 251940 + ... + 252168.

It is an arithmetic number, because the mean of its divisors is an integer number (1524900).

Almost surely, 2^57720366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57720366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73195200).

57720366 is an abundant number, since it is smaller than the sum of its proper divisors (88670034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57720366 is a wasteful number, since it uses less digits than its factorization.

57720366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 57720366 is about 7597.3920525401. The cubic root of 57720366 is about 386.4645761574.

The spelling of 57720366 in words is "fifty-seven million, seven hundred twenty thousand, three hundred sixty-six".