63861487 has 4 divisors (see below), whose sum is σ = 63877480. Its totient is φ = 63845496.

The previous prime is 63861481. The next prime is 63861557. The reversal of 63861487 is 78416836.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 63861487 - 2⁷ = 63861359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63861481) 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, 3589 + ... + 11857.

It is an arithmetic number, because the mean of its divisors is an integer number (15969370).

Almost surely, 2^63861487 is an apocalyptic number.

63861487 is a deficient number, since it is larger than the sum of its proper divisors (15993).

63861487 is an equidigital number, since it uses as much as digits as its factorization.

63861487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15992.

The product of its digits is 193536, while the sum is 43.

The square root of 63861487 is about 7991.3382483787. The cubic root of 63861487 is about 399.7112228195.

The spelling of 63861487 in words is "sixty-three million, eight hundred sixty-one thousand, four hundred eighty-seven".