47664409 has 4 divisors (see below), whose sum is σ = 51330916. Its totient is φ = 43997904.

The previous prime is 47664377. The next prime is 47664433. The reversal of 47664409 is 90446674.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20070400 + 27594009 = 4480^2 + 5253^2 .

It is a cyclic number.

It is not a de Polignac number, because 47664409 - 2⁵ = 47664377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47664469) 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, 1833234 + ... + 1833259.

It is an arithmetic number, because the mean of its divisors is an integer number (12832729).

Almost surely, 2^47664409 is an apocalyptic number.

It is an amenable number.

47664409 is a deficient number, since it is larger than the sum of its proper divisors (3666507).

47664409 is a wasteful number, since it uses less digits than its factorization.

47664409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666506.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 47664409 is about 6903.9415553726. The cubic root of 47664409 is about 362.5751796510.

The spelling of 47664409 in words is "forty-seven million, six hundred sixty-four thousand, four hundred nine".