63694889 has 4 divisors (see below), whose sum is σ = 66464256. Its totient is φ = 60925524.

The previous prime is 63694879. The next prime is 63694907. The reversal of 63694889 is 98849636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63694889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63694889.

It is not an unprimeable number, because it can be changed into a prime (63694849) 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, 1384649 + ... + 1384694.

It is an arithmetic number, because the mean of its divisors is an integer number (16616064).

Almost surely, 2^63694889 is an apocalyptic number.

It is an amenable number.

63694889 is a deficient number, since it is larger than the sum of its proper divisors (2769367).

63694889 is a wasteful number, since it uses less digits than its factorization.

63694889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769366.

The product of its digits is 2239488, while the sum is 53.

The square root of 63694889 is about 7980.9077804470. The cubic root of 63694889 is about 399.3633392788.

The spelling of 63694889 in words is "sixty-three million, six hundred ninety-four thousand, eight hundred eighty-nine".