642617449 has 16 divisors (see below), whose sum is σ = 686321280. Its totient is φ = 599961600.

The previous prime is 642617431. The next prime is 642617453. The reversal of 642617449 is 944716246.

It is a cyclic number.

It is not a de Polignac number, because 642617449 - 2⁹ = 642616937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642617489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492532 + ... + 493834.

It is an arithmetic number, because the mean of its divisors is an integer number (42895080).

Almost surely, 2^642617449 is an apocalyptic number.

It is an amenable number.

642617449 is a deficient number, since it is larger than the sum of its proper divisors (43703831).

642617449 is a wasteful number, since it uses less digits than its factorization.

642617449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its digits is 290304, while the sum is 43.

The square root of 642617449 is about 25349.9003745577. The cubic root of 642617449 is about 862.9470953427.

The spelling of 642617449 in words is "six hundred forty-two million, six hundred seventeen thousand, four hundred forty-nine".