42720992 has 24 divisors (see below), whose sum is σ = 84424032. Its totient is φ = 21280000.

The previous prime is 42720991. The next prime is 42721027. The reversal of 42720992 is 29902724.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42720991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6617 + ... + 11367.

It is an arithmetic number, because the mean of its divisors is an integer number (3517668).

Almost surely, 2^42720992 is an apocalyptic number.

It is an amenable number.

42720992 is a deficient number, since it is larger than the sum of its proper divisors (41703040).

42720992 is a wasteful number, since it uses less digits than its factorization.

42720992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042 (or 5034 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 42720992 is about 6536.1297416743. The cubic root of 42720992 is about 349.5804278395.

The spelling of 42720992 in words is "forty-two million, seven hundred twenty thousand, nine hundred ninety-two".