57007720 has 128 divisors (see below), whose sum is σ = 162570240. Its totient is φ = 17475840.

The previous prime is 57007703. The next prime is 57007739. The reversal of 57007720 is 2770075.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255529 + ... + 255751.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^57007720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57007720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81285120).

57007720 is an abundant number, since it is smaller than the sum of its proper divisors (105562520).

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

57007720 is a wasteful number, since it uses less digits than its factorization.

57007720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 3430, while the sum is 28.

The square root of 57007720 is about 7550.3456874503. The cubic root of 57007720 is about 384.8674868631.

Adding to 57007720 its reverse (2770075), we get a palindrome (59777795).

The spelling of 57007720 in words is "fifty-seven million, seven thousand, seven hundred twenty".