63668893 has 4 divisors (see below), whose sum is σ = 67414140. Its totient is φ = 59923648.

The previous prime is 63668887. The next prime is 63668987. The reversal of 63668893 is 39886636.

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 42536484 + 21132409 = 6522^2 + 4597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63668893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63668873) 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, 1872598 + ... + 1872631.

It is an arithmetic number, because the mean of its divisors is an integer number (16853535).

Almost surely, 2^63668893 is an apocalyptic number.

It is an amenable number.

63668893 is a deficient number, since it is larger than the sum of its proper divisors (3745247).

63668893 is a wasteful number, since it uses less digits than its factorization.

63668893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745246.

The product of its digits is 1119744, while the sum is 49.

The square root of 63668893 is about 7979.2789774515. The cubic root of 63668893 is about 399.3090007374.

The spelling of 63668893 in words is "sixty-three million, six hundred sixty-eight thousand, eight hundred ninety-three".