42544890 has 24 divisors (see below), whose sum is σ = 110616948. Its totient is φ = 11345280.

The previous prime is 42544883. The next prime is 42544891. The reversal of 42544890 is 9844524.

It can be written as a sum of positive squares in 2 ways, for example, as 35748441 + 6796449 = 5979^2 + 2607^2 .

It is a super-2 number, since 2×42544890² = 3620135330224200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (42544891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236271 + ... + 236450.

Almost surely, 2^42544890 is an apocalyptic number.

42544890 is an abundant number, since it is smaller than the sum of its proper divisors (68072058).

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

42544890 is a wasteful number, since it uses less digits than its factorization.

42544890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472734 (or 472731 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 42544890 is about 6522.6444023877. The cubic root of 42544890 is about 349.0994262467.

It can be divided in two parts, 42544 and 890, that added together give a palindrome (43434).

The spelling of 42544890 in words is "forty-two million, five hundred forty-four thousand, eight hundred ninety".