42087870 has 128 divisors (see below), whose sum is σ = 126074880. Its totient is φ = 9901440.

The previous prime is 42087823. The next prime is 42087887. The reversal of 42087870 is 7878024.

42087870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×42087870² = 3542777602273800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109699 + ... + 110081.

It is an arithmetic number, because the mean of its divisors is an integer number (984960).

Almost surely, 2^42087870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42087870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63037440).

42087870 is an abundant number, since it is smaller than the sum of its proper divisors (83987010).

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

42087870 is a wasteful number, since it uses less digits than its factorization.

42087870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 42087870 is about 6487.5164739675. The cubic root of 42087870 is about 347.8449071089.

The spelling of 42087870 in words is "forty-two million, eighty-seven thousand, eight hundred seventy".