42561370 has 16 divisors (see below), whose sum is σ = 81117288. Its totient is φ = 16023040.

The previous prime is 42561341. The next prime is 42561377. The reversal of 42561370 is 7316524.

It can be written as a sum of positive squares in 4 ways, for example, as 42497361 + 64009 = 6519^2 + 253^2 .

It is a super-2 number, since 2×42561370² = 3622940432553800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42561377) 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, 125011 + ... + 125350.

Almost surely, 2^42561370 is an apocalyptic number.

42561370 is a deficient number, since it is larger than the sum of its proper divisors (38555918).

42561370 is a wasteful number, since it uses less digits than its factorization.

42561370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250385.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 42561370 is about 6523.9075713870. The cubic root of 42561370 is about 349.1444956300.

Adding to 42561370 its reverse (7316524), we get a palindrome (49877894).

The spelling of 42561370 in words is "forty-two million, five hundred sixty-one thousand, three hundred seventy".