49478809 has 4 divisors (see below), whose sum is σ = 49497616. Its totient is φ = 49460004.

The previous prime is 49478797. The next prime is 49478837. The reversal of 49478809 is 90887494.

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 49478809 - 2¹¹ = 49476761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49478899) 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, 4659 + ... + 10984.

It is an arithmetic number, because the mean of its divisors is an integer number (12374404).

Almost surely, 2^49478809 is an apocalyptic number.

It is an amenable number.

49478809 is a deficient number, since it is larger than the sum of its proper divisors (18807).

49478809 is a wasteful number, since it uses less digits than its factorization.

49478809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18806.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 49478809 is about 7034.1174997294. The cubic root of 49478809 is about 367.1186201953.

The spelling of 49478809 in words is "forty-nine million, four hundred seventy-eight thousand, eight hundred nine".