63891340 has 12 divisors (see below), whose sum is σ = 134171856. Its totient is φ = 25556528.

The previous prime is 63891301. The next prime is 63891343. The reversal of 63891340 is 4319836.

It is a junction number, because it is equal to n+sod(n) for n = 63891296 and 63891305.

It is not an unprimeable number, because it can be changed into a prime (63891343) 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, 1597264 + ... + 1597303.

It is an arithmetic number, because the mean of its divisors is an integer number (11180988).

Almost surely, 2^63891340 is an apocalyptic number.

It is an amenable number.

63891340 is an abundant number, since it is smaller than the sum of its proper divisors (70280516).

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

63891340 is a wasteful number, since it uses less digits than its factorization.

63891340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3194576 (or 3194574 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 63891340 is about 7993.2058649831. The cubic root of 63891340 is about 399.7734967649.

The spelling of 63891340 in words is "sixty-three million, eight hundred ninety-one thousand, three hundred forty".