42721606 has 16 divisors (see below), whose sum is σ = 66227616. Its totient is φ = 20653056.

The previous prime is 42721583. The next prime is 42721607. The reversal of 42721606 is 60612724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42721607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10630 + ... + 14086.

It is an arithmetic number, because the mean of its divisors is an integer number (4139226).

Almost surely, 2^42721606 is an apocalyptic number.

42721606 is a deficient number, since it is larger than the sum of its proper divisors (23506010).

42721606 is a wasteful number, since it uses less digits than its factorization.

42721606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 42721606 is about 6536.1767111975. The cubic root of 42721606 is about 349.5821025927.

The spelling of 42721606 in words is "forty-two million, seven hundred twenty-one thousand, six hundred six".