42724666 has 4 divisors (see below), whose sum is σ = 64087002. Its totient is φ = 21362332.

The previous prime is 42724663. The next prime is 42724667. The reversal of 42724666 is 66642724.

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

It can be written as a sum of positive squares in only one way, i.e., 25210441 + 17514225 = 5021^2 + 4185^2 .

It is not an unprimeable number, because it can be changed into a prime (42724663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681165 + ... + 10681168.

Almost surely, 2^42724666 is an apocalyptic number.

42724666 is a deficient number, since it is larger than the sum of its proper divisors (21362336).

42724666 is a wasteful number, since it uses less digits than its factorization.

42724666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21362335.

The product of its digits is 96768, while the sum is 37.

The square root of 42724666 is about 6536.4107888045. The cubic root of 42724666 is about 349.5904488434.

The spelling of 42724666 in words is "forty-two million, seven hundred twenty-four thousand, six hundred sixty-six".