63977521 has 8 divisors (see below), whose sum is σ = 66361088. Its totient is φ = 61614000.

The previous prime is 63977497. The next prime is 63977539. The reversal of 63977521 is 12577936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63977521 - 2¹⁷ = 63846449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63977321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651 + ... + 11431.

It is an arithmetic number, because the mean of its divisors is an integer number (8295136).

Almost surely, 2^63977521 is an apocalyptic number.

It is an amenable number.

63977521 is a deficient number, since it is larger than the sum of its proper divisors (2383567).

63977521 is a wasteful number, since it uses less digits than its factorization.

63977521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10023.

The product of its digits is 79380, while the sum is 40.

The square root of 63977521 is about 7998.5949391127. The cubic root of 63977521 is about 399.9531632660.

The spelling of 63977521 in words is "sixty-three million, nine hundred seventy-seven thousand, five hundred twenty-one".