42244640 has 24 divisors (see below), whose sum is σ = 99803340. Its totient is φ = 16897792.

The previous prime is 42244633. The next prime is 42244663. The reversal of 42244640 is 4644224.

It can be written as a sum of positive squares in 2 ways, for example, as 36917776 + 5326864 = 6076^2 + 2308^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131855 + ... + 132174.

Almost surely, 2^42244640 is an apocalyptic number.

42244640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42244640 is an abundant number, since it is smaller than the sum of its proper divisors (57558700).

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

42244640 is a wasteful number, since it uses less digits than its factorization.

42244640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264044 (or 264036 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 42244640 is about 6499.5876792301. The cubic root of 42244640 is about 348.2762592529.

Adding to 42244640 its reverse (4644224), we get a palindrome (46888864).

The spelling of 42244640 in words is "forty-two million, two hundred forty-four thousand, six hundred forty".