42720446 has 4 divisors (see below), whose sum is σ = 64080672. Its totient is φ = 21360222.

The previous prime is 42720427. The next prime is 42720497. The reversal of 42720446 is 64402724.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10680110 + ... + 10680113.

It is an arithmetic number, because the mean of its divisors is an integer number (16020168).

Almost surely, 2^42720446 is an apocalyptic number.

42720446 is a deficient number, since it is larger than the sum of its proper divisors (21360226).

42720446 is a wasteful number, since it uses less digits than its factorization.

42720446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21360225.

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 42720446 is about 6536.0879737041. The cubic root of 42720446 is about 349.5789385504.

The spelling of 42720446 in words is "forty-two million, seven hundred twenty thousand, four hundred forty-six".