63720987 has 8 divisors (see below), whose sum is σ = 92685120. Its totient is φ = 38618760.

The previous prime is 63720983. The next prime is 63720997. The reversal of 63720987 is 78902736.

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

It is not a de Polignac number, because 63720987 - 2² = 63720983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63720983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965437 + ... + 965502.

It is an arithmetic number, because the mean of its divisors is an integer number (11585640).

Almost surely, 2^63720987 is an apocalyptic number.

63720987 is a deficient number, since it is larger than the sum of its proper divisors (28964133).

63720987 is a wasteful number, since it uses less digits than its factorization.

63720987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930953.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 63720987 is about 7982.5426400364. The cubic root of 63720987 is about 399.4178761572.

The spelling of 63720987 in words is "sixty-three million, seven hundred twenty thousand, nine hundred eighty-seven".