47667809 has 4 divisors (see below), whose sum is σ = 54477504. Its totient is φ = 40858116.

The previous prime is 47667791. The next prime is 47667817. The reversal of 47667809 is 90876674.

It is a happy number.

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 47667809 - 2²⁰ = 46619233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47663809) 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, 3404837 + ... + 3404850.

It is an arithmetic number, because the mean of its divisors is an integer number (13619376).

Almost surely, 2^47667809 is an apocalyptic number.

It is an amenable number.

47667809 is a deficient number, since it is larger than the sum of its proper divisors (6809695).

47667809 is an equidigital number, since it uses as much as digits as its factorization.

47667809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809694.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 47667809 is about 6904.1877871333. The cubic root of 47667809 is about 362.5838005230.

The spelling of 47667809 in words is "forty-seven million, six hundred sixty-seven thousand, eight hundred nine".