7642213809 has 4 divisors (see below), whose sum is σ = 10189618416. Its totient is φ = 5094809204.

The previous prime is 7642213793. The next prime is 7642213811. The reversal of 7642213809 is 9083122467.

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 a cyclic number.

It is not a de Polignac number, because 7642213809 - 2⁴ = 7642213793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7642213849) 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, 1273702299 + ... + 1273702304.

It is an arithmetic number, because the mean of its divisors is an integer number (2547404604).

Almost surely, 2^7642213809 is an apocalyptic number.

It is an amenable number.

7642213809 is a deficient number, since it is larger than the sum of its proper divisors (2547404607).

7642213809 is a wasteful number, since it uses less digits than its factorization.

7642213809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547404606.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 7642213809 is about 87419.7563997979. The cubic root of 7642213809 is about 1969.7286173961.

The spelling of 7642213809 in words is "seven billion, six hundred forty-two million, two hundred thirteen thousand, eight hundred nine".