47872809 has 8 divisors (see below), whose sum is σ = 70922720. Its totient is φ = 31915188.

The previous prime is 47872807. The next prime is 47872817. The reversal of 47872809 is 90827874.

It is not a de Polignac number, because 47872809 - 2¹ = 47872807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47872807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 886507 + ... + 886560.

It is an arithmetic number, because the mean of its divisors is an integer number (8865340).

Almost surely, 2^47872809 is an apocalyptic number.

It is an amenable number.

47872809 is a deficient number, since it is larger than the sum of its proper divisors (23049911).

47872809 is a wasteful number, since it uses less digits than its factorization.

47872809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773076 (or 1773070 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 47872809 is about 6919.0179216418. The cubic root of 47872809 is about 363.1028326926.

The spelling of 47872809 in words is "forty-seven million, eight hundred seventy-two thousand, eight hundred nine".