63867890 has 16 divisors (see below), whose sum is σ = 115382232. Its totient is φ = 25453824.

The previous prime is 63867887. The next prime is 63867899. The reversal of 63867890 is 9876836.

It can be written as a sum of positive squares in 4 ways, for example, as 56145049 + 7722841 = 7493^2 + 2779^2 .

It is not an unprimeable number, because it can be changed into a prime (63867899) 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, 8759 + ... + 14298.

Almost surely, 2^63867890 is an apocalyptic number.

63867890 is a deficient number, since it is larger than the sum of its proper divisors (51514342).

63867890 is a wasteful number, since it uses less digits than its factorization.

63867890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23341.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 63867890 is about 7991.7388595975. The cubic root of 63867890 is about 399.7245812381.

The spelling of 63867890 in words is "sixty-three million, eight hundred sixty-seven thousand, eight hundred ninety".