642723459 has 16 divisors (see below), whose sum is σ = 981795840. Its totient is φ = 366367680.

The previous prime is 642723457. The next prime is 642723479. The reversal of 642723459 is 954327246.

642723459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642723459 - 2¹ = 642723457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642723459.

It is not an unprimeable number, because it can be changed into a prime (642723457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28827 + ... + 46004.

It is an arithmetic number, because the mean of its divisors is an integer number (61362240).

Almost surely, 2^642723459 is an apocalyptic number.

642723459 is a deficient number, since it is larger than the sum of its proper divisors (339072381).

642723459 is a wasteful number, since it uses less digits than its factorization.

642723459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75250.

The product of its digits is 362880, while the sum is 42.

The square root of 642723459 is about 25351.9912235706. The cubic root of 642723459 is about 862.9945450303.

The spelling of 642723459 in words is "six hundred forty-two million, seven hundred twenty-three thousand, four hundred fifty-nine".