42817820 has 24 divisors (see below), whose sum is σ = 92819328. Its totient is φ = 16574400.

The previous prime is 42817787. The next prime is 42817823. The reversal of 42817820 is 2871824.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42817823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33911 + ... + 35150.

It is an arithmetic number, because the mean of its divisors is an integer number (3867472).

Almost surely, 2^42817820 is an apocalyptic number.

It is an amenable number.

42817820 is an abundant number, since it is smaller than the sum of its proper divisors (50001508).

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

42817820 is a wasteful number, since it uses less digits than its factorization.

42817820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69101 (or 69099 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 42817820 is about 6543.5326850257. The cubic root of 42817820 is about 349.8443389439.

The spelling of 42817820 in words is "forty-two million, eight hundred seventeen thousand, eight hundred twenty".