57782780 has 24 divisors (see below), whose sum is σ = 132375600. Its totient is φ = 21011840.

The previous prime is 57782759. The next prime is 57782783. The reversal of 57782780 is 8728775.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57782783) 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, 131105 + ... + 131544.

It is an arithmetic number, because the mean of its divisors is an integer number (5515650).

Almost surely, 2^57782780 is an apocalyptic number.

It is an amenable number.

57782780 is an abundant number, since it is smaller than the sum of its proper divisors (74592820).

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

57782780 is a wasteful number, since it uses less digits than its factorization.

57782780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262669 (or 262667 counting only the distinct ones).

The product of its (nonzero) digits is 219520, while the sum is 44.

The square root of 57782780 is about 7601.4985364729. The cubic root of 57782780 is about 386.6038228558.

It can be divided in two parts, 5778 and 2780, that added together give a palindrome (8558).

The spelling of 57782780 in words is "fifty-seven million, seven hundred eighty-two thousand, seven hundred eighty".