42544100 has 18 divisors (see below), whose sum is σ = 92320914. Its totient is φ = 17017600.

The previous prime is 42544091. The next prime is 42544109. The reversal of 42544100 is 144524.

It is an interprime number because it is at equal distance from previous prime (42544091) and next prime (42544109).

It can be written as a sum of positive squares in 3 ways, for example, as 2119936 + 40424164 = 1456^2 + 6358^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (42544109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212621 + ... + 212820.

Almost surely, 2^42544100 is an apocalyptic number.

It is an amenable number.

42544100 is an abundant number, since it is smaller than the sum of its proper divisors (49776814).

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

42544100 is a wasteful number, since it uses less digits than its factorization.

42544100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425455 (or 425448 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 42544100 is about 6522.5838438459. The cubic root of 42544100 is about 349.0972654682.

Adding to 42544100 its reverse (144524), we get a palindrome (42688624).

The spelling of 42544100 in words is "forty-two million, five hundred forty-four thousand, one hundred".