42821668 has 24 divisors (see below), whose sum is σ = 80377920. Its totient is φ = 19899360.

The previous prime is 42821629. The next prime is 42821683. The reversal of 42821668 is 86612824.

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, 1288 + ... + 9343.

It is an arithmetic number, because the mean of its divisors is an integer number (3349080).

Almost surely, 2^42821668 is an apocalyptic number.

It is an amenable number.

42821668 is a deficient number, since it is larger than the sum of its proper divisors (37556252).

42821668 is a wasteful number, since it uses less digits than its factorization.

42821668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10707 (or 10705 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 42821668 is about 6543.8267091970. The cubic root of 42821668 is about 349.8548186981.

The spelling of 42821668 in words is "forty-two million, eight hundred twenty-one thousand, six hundred sixty-eight".