63891140 has 12 divisors (see below), whose sum is σ = 134171436. Its totient is φ = 25556448.

The previous prime is 63891131. The next prime is 63891143. The reversal of 63891140 is 4119836.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49084036 + 14807104 = 7006^2 + 3848^2 .

It is a junction number, because it is equal to n+sod(n) for n = 63891097 and 63891106.

It is not an unprimeable number, because it can be changed into a prime (63891143) 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, 1597259 + ... + 1597298.

It is an arithmetic number, because the mean of its divisors is an integer number (11180953).

Almost surely, 2^63891140 is an apocalyptic number.

It is an amenable number.

63891140 is an abundant number, since it is smaller than the sum of its proper divisors (70280296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63891140 is a wasteful number, since it uses less digits than its factorization.

63891140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194566 (or 3194564 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 63891140 is about 7993.1933543484. The cubic root of 63891140 is about 399.7730796255.

The spelling of 63891140 in words is "sixty-three million, eight hundred ninety-one thousand, one hundred forty".