42087864 has 96 divisors (see below), whose sum is σ = 131861520. Its totient is φ = 11096064.

The previous prime is 42087823. The next prime is 42087887. The reversal of 42087864 is 46878024.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13912 + ... + 16664.

Almost surely, 2^42087864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42087864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65930760).

42087864 is an abundant number, since it is smaller than the sum of its proper divisors (89773656).

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

42087864 is a wasteful number, since it uses less digits than its factorization.

42087864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789 (or 2778 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 42087864 is about 6487.5160115409. The cubic root of 42087864 is about 347.8448905795.

The spelling of 42087864 in words is "forty-two million, eighty-seven thousand, eight hundred sixty-four".