49778109 has 6 divisors (see below), whose sum is σ = 71901726. Its totient is φ = 33185400.

The previous prime is 49778089. The next prime is 49778143. The reversal of 49778109 is 90187794.

It can be written as a sum of positive squares in only one way, i.e., 27594009 + 22184100 = 5253^2 + 4710^2 .

It is not a de Polignac number, because 49778109 - 2⁹ = 49777597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49778009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2765442 + ... + 2765459.

It is an arithmetic number, because the mean of its divisors is an integer number (11983621).

Almost surely, 2^49778109 is an apocalyptic number.

It is an amenable number.

49778109 is a deficient number, since it is larger than the sum of its proper divisors (22123617).

49778109 is a wasteful number, since it uses less digits than its factorization.

49778109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530907 (or 5530904 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 49778109 is about 7055.3603026352. The cubic root of 49778109 is about 367.8573727570.

It can be divided in two parts, 497 and 78109, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 49778109 in words is "forty-nine million, seven hundred seventy-eight thousand, one hundred nine".