63640449 has 12 divisors (see below), whose sum is σ = 92132196. Its totient is φ = 42331392.

The previous prime is 63640441. The next prime is 63640453. The reversal of 63640449 is 94404636.

63640449 is a `hidden beast` number, since 6 + 3 + 640 + 4 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42185025 + 21455424 = 6495^2 + 4632^2 .

It is not a de Polignac number, because 63640449 - 2³ = 63640441 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63640441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3624 + ... + 11849.

It is an arithmetic number, because the mean of its divisors is an integer number (7677683).

Almost surely, 2^63640449 is an apocalyptic number.

It is an amenable number.

63640449 is a deficient number, since it is larger than the sum of its proper divisors (28491747).

63640449 is a wasteful number, since it uses less digits than its factorization.

63640449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15936 (or 15933 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 63640449 is about 7977.4964117823. The cubic root of 63640449 is about 399.2495282777.

The spelling of 63640449 in words is "sixty-three million, six hundred forty thousand, four hundred forty-nine".