42817720 has 64 divisors (see below), whose sum is σ = 109693440. Its totient is φ = 14889600.

The previous prime is 42817703. The next prime is 42817739. The reversal of 42817720 is 2771824.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8005 + ... + 12235.

It is an arithmetic number, because the mean of its divisors is an integer number (1713960).

Almost surely, 2^42817720 is an apocalyptic number.

42817720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42817720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54846720).

42817720 is an abundant number, since it is smaller than the sum of its proper divisors (66875720).

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

42817720 is a wasteful number, since it uses less digits than its factorization.

42817720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4276 (or 4272 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 42817720 is about 6543.5250438888. The cubic root of 42817720 is about 349.8440665927.

The spelling of 42817720 in words is "forty-two million, eight hundred seventeen thousand, seven hundred twenty".