42722649 has 24 divisors (see below), whose sum is σ = 65999232. Its totient is φ = 26536320.

The previous prime is 42722633. The next prime is 42722651. The reversal of 42722649 is 94622724.

42722649 is a `hidden beast` number, since 4 + 2 + 7 + 2 + 2 + 649 = 666.

It is not a de Polignac number, because 42722649 - 2⁴ = 42722633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42722609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14404 + ... + 17114.

It is an arithmetic number, because the mean of its divisors is an integer number (2749968).

Almost surely, 2^42722649 is an apocalyptic number.

It is an amenable number.

42722649 is a deficient number, since it is larger than the sum of its proper divisors (23276583).

42722649 is a wasteful number, since it uses less digits than its factorization.

42722649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837 (or 2834 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 42722649 is about 6536.2564974150. The cubic root of 42722649 is about 349.5849474543.

The spelling of 42722649 in words is "forty-two million, seven hundred twenty-two thousand, six hundred forty-nine".