42557780 has 24 divisors (see below), whose sum is σ = 90296808. Its totient is φ = 16846848.

The previous prime is 42557747. The next prime is 42557791. The reversal of 42557780 is 8775524.

It can be written as a sum of positive squares in 4 ways, for example, as 515524 + 42042256 = 718^2 + 6484^2 .

It is a super-2 number, since 2×42557780² = 3622329277056800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9029 + ... + 12908.

It is an arithmetic number, because the mean of its divisors is an integer number (3762367).

Almost surely, 2^42557780 is an apocalyptic number.

It is an amenable number.

42557780 is an abundant number, since it is smaller than the sum of its proper divisors (47739028).

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

42557780 is a wasteful number, since it uses less digits than its factorization.

42557780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22043 (or 22041 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 42557780 is about 6523.6324237345. The cubic root of 42557780 is about 349.1346787155.

The spelling of 42557780 in words is "forty-two million, five hundred fifty-seven thousand, seven hundred eighty".