642593649 has 4 divisors (see below), whose sum is σ = 856791536. Its totient is φ = 428395764.

The previous prime is 642593647. The next prime is 642593657. The reversal of 642593649 is 946395246.

642593649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 642593649 - 2¹ = 642593647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642593598 and 642593607.

It is not an unprimeable number, because it can be changed into a prime (642593647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107098939 + ... + 107098944.

It is an arithmetic number, because the mean of its divisors is an integer number (214197884).

Almost surely, 2^642593649 is an apocalyptic number.

It is an amenable number.

642593649 is a deficient number, since it is larger than the sum of its proper divisors (214197887).

642593649 is a wasteful number, since it uses less digits than its factorization.

642593649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214197886.

The product of its digits is 1399680, while the sum is 48.

The square root of 642593649 is about 25349.4309403584. The cubic root of 642593649 is about 862.9364418326.

The spelling of 642593649 in words is "six hundred forty-two million, five hundred ninety-three thousand, six hundred forty-nine".