49640665 has 4 divisors (see below), whose sum is σ = 59568804. Its totient is φ = 39712528.

The previous prime is 49640659. The next prime is 49640707. The reversal of 49640665 is 56604694.

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 11744329 + 37896336 = 3427^2 + 6156^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-49640665 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 4964062 + ... + 4964071.

It is an arithmetic number, because the mean of its divisors is an integer number (14892201).

Almost surely, 2^49640665 is an apocalyptic number.

It is an amenable number.

49640665 is a deficient number, since it is larger than the sum of its proper divisors (9928139).

49640665 is an equidigital number, since it uses as much as digits as its factorization.

49640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9928138.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 49640665 is about 7045.6131741673. The cubic root of 49640665 is about 367.5184929069.

It can be divided in two parts, 49640 and 665, that added together give a palindrome (50305).

The spelling of 49640665 in words is "forty-nine million, six hundred forty thousand, six hundred sixty-five".