63900691 has 4 divisors (see below), whose sum is σ = 64222000. Its totient is φ = 63579384.

The previous prime is 63900689. The next prime is 63900701. The reversal of 63900691 is 19600936.

63900691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63900691 - 2¹ = 63900689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63900631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160356 + ... + 160753.

It is an arithmetic number, because the mean of its divisors is an integer number (16055500).

Almost surely, 2^63900691 is an apocalyptic number.

63900691 is a deficient number, since it is larger than the sum of its proper divisors (321309).

63900691 is a wasteful number, since it uses less digits than its factorization.

63900691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321308.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 63900691 is about 7993.7907778475. The cubic root of 63900691 is about 399.7929991451.

The spelling of 63900691 in words is "sixty-three million, nine hundred thousand, six hundred ninety-one".