63691287 has 16 divisors (see below), whose sum is σ = 97518720. Its totient is φ = 36568800.

The previous prime is 63691273. The next prime is 63691297. The reversal of 63691287 is 78219636.

It is a happy number.

It is not a de Polignac number, because 63691287 - 2⁶ = 63691223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63691217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50164 + ... + 51417.

It is an arithmetic number, because the mean of its divisors is an integer number (6094920).

Almost surely, 2^63691287 is an apocalyptic number.

63691287 is a deficient number, since it is larger than the sum of its proper divisors (33827433).

63691287 is a wasteful number, since it uses less digits than its factorization.

63691287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101614.

The product of its digits is 108864, while the sum is 42.

The square root of 63691287 is about 7980.6821137043. The cubic root of 63691287 is about 399.3558110250.

The spelling of 63691287 in words is "sixty-three million, six hundred ninety-one thousand, two hundred eighty-seven".