42642220 has 24 divisors (see below), whose sum is σ = 90778464. Its totient is φ = 16822656.

The previous prime is 42642179. The next prime is 42642247. The reversal of 42642220 is 2224624.

42642220 = 728² + 729² + ... + 800².

It is a junction number, because it is equal to n+sod(n) for n = 42642191 and 42642200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13144 + ... + 16063.

It is an arithmetic number, because the mean of its divisors is an integer number (3782436).

Almost surely, 2^42642220 is an apocalyptic number.

It is an amenable number.

42642220 is an abundant number, since it is smaller than the sum of its proper divisors (48136244).

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

42642220 is a wasteful number, since it uses less digits than its factorization.

42642220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29289 (or 29287 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 42642220 is about 6530.1010711933. The cubic root of 42642220 is about 349.3654352366.

Adding to 42642220 its reverse (2224624), we get a palindrome (44866844).

The spelling of 42642220 in words is "forty-two million, six hundred forty-two thousand, two hundred twenty".