63680387 has 4 divisors (see below), whose sum is σ = 63733680. Its totient is φ = 63627096.

The previous prime is 63680363. The next prime is 63680389. The reversal of 63680387 is 78308636.

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 63680387 - 2¹⁶ = 63614851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63680389) 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, 24812 + ... + 27257.

It is an arithmetic number, because the mean of its divisors is an integer number (15933420).

Almost surely, 2^63680387 is an apocalyptic number.

63680387 is a deficient number, since it is larger than the sum of its proper divisors (53293).

63680387 is a wasteful number, since it uses less digits than its factorization.

63680387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53292.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 63680387 is about 7979.9991854636. Note that the first 3 decimals coincide. The cubic root of 63680387 is about 399.3330280726. Note that the first 3 decimals are identical.

The spelling of 63680387 in words is "sixty-three million, six hundred eighty thousand, three hundred eighty-seven".