49878813 has 4 divisors (see below), whose sum is σ = 66505088. Its totient is φ = 33252540.

The previous prime is 49878809. The next prime is 49878853. The reversal of 49878813 is 31887894.

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 not a de Polignac number, because 49878813 - 2² = 49878809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49878853) 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, 8313133 + ... + 8313138.

It is an arithmetic number, because the mean of its divisors is an integer number (16626272).

Almost surely, 2^49878813 is an apocalyptic number.

It is an amenable number.

49878813 is a deficient number, since it is larger than the sum of its proper divisors (16626275).

49878813 is a wasteful number, since it uses less digits than its factorization.

49878813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16626274.

The product of its digits is 387072, while the sum is 48.

The square root of 49878813 is about 7062.4933982270. The cubic root of 49878813 is about 368.1052712573.

The spelling of 49878813 in words is "forty-nine million, eight hundred seventy-eight thousand, eight hundred thirteen".