42641820 has 72 divisors (see below), whose sum is σ = 139304256. Its totient is φ = 10495872.

The previous prime is 42641813. The next prime is 42641821. The reversal of 42641820 is 2814624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42641821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6772 + ... + 11451.

Almost surely, 2^42641820 is an apocalyptic number.

It is an amenable number.

42641820 is an abundant number, since it is smaller than the sum of its proper divisors (96662436).

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

42641820 is a wasteful number, since it uses less digits than its factorization.

42641820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18251 (or 18246 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 42641820 is about 6530.0704437242. The cubic root of 42641820 is about 349.3643428403.

It can be divided in two parts, 4264 and 1820, that added together give a square (6084 = 78²).

The spelling of 42641820 in words is "forty-two million, six hundred forty-one thousand, eight hundred twenty".