57661220 has 12 divisors (see below), whose sum is σ = 121088604. Its totient is φ = 23064480.

The previous prime is 57661217. The next prime is 57661249. The reversal of 57661220 is 2216675.

It can be written as a sum of positive squares in 2 ways, for example, as 27102436 + 30558784 = 5206^2 + 5528^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441511 + ... + 1441550.

It is an arithmetic number, because the mean of its divisors is an integer number (10090717).

Almost surely, 2^57661220 is an apocalyptic number.

It is an amenable number.

57661220 is an abundant number, since it is smaller than the sum of its proper divisors (63427384).

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

57661220 is a wasteful number, since it uses less digits than its factorization.

57661220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883070 (or 2883068 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 57661220 is about 7593.4985349310. The cubic root of 57661220 is about 386.3325277585.

Adding to 57661220 its reverse (2216675), we get a palindrome (59877895).

The spelling of 57661220 in words is "fifty-seven million, six hundred sixty-one thousand, two hundred twenty".