49999645 has 4 divisors (see below), whose sum is σ = 59999580. Its totient is φ = 39999712.

The previous prime is 49999643. The next prime is 49999667. The reversal of 49999645 is 54699994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54699994 = 2 ⋅27349997.

It can be written as a sum of positive squares in 2 ways, for example, as 16208676 + 33790969 = 4026^2 + 5813^2 .

It is a cyclic number.

It is not a de Polignac number, because 49999645 - 2¹ = 49999643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (49999643) 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, 4999960 + ... + 4999969.

It is an arithmetic number, because the mean of its divisors is an integer number (14999895).

Almost surely, 2^49999645 is an apocalyptic number.

It is an amenable number.

49999645 is a deficient number, since it is larger than the sum of its proper divisors (9999935).

49999645 is an equidigital number, since it uses as much as digits as its factorization.

49999645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999934.

The product of its digits is 3149280, while the sum is 55.

The square root of 49999645 is about 7071.0427095302. The cubic root of 49999645 is about 368.4022779745.

The spelling of 49999645 in words is "forty-nine million, nine hundred ninety-nine thousand, six hundred forty-five".