49781665 has 4 divisors (see below), whose sum is σ = 59738004. Its totient is φ = 39825328.

The previous prime is 49781647. The next prime is 49781701. The reversal of 49781665 is 56618794.

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 24137569 + 25644096 = 4913^2 + 5064^2 .

It is a cyclic number.

It is not a de Polignac number, because 49781665 - 2¹⁷ = 49650593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4978162 + ... + 4978171.

It is an arithmetic number, because the mean of its divisors is an integer number (14934501).

Almost surely, 2^49781665 is an apocalyptic number.

It is an amenable number.

49781665 is a deficient number, since it is larger than the sum of its proper divisors (9956339).

49781665 is an equidigital number, since it uses as much as digits as its factorization.

49781665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9956338.

The product of its digits is 362880, while the sum is 46.

The square root of 49781665 is about 7055.6123051086. The cubic root of 49781665 is about 367.8661320939.

The spelling of 49781665 in words is "forty-nine million, seven hundred eighty-one thousand, six hundred sixty-five".