63891612 has 96 divisors (see below), whose sum is σ = 173859840. Its totient is φ = 20269440.

The previous prime is 63891533. The next prime is 63891613. The reversal of 63891612 is 21619836.

63891612 is a `hidden beast` number, since 6 + 38 + 9 + 1 + 612 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63891613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207963 + ... + 208269.

It is an arithmetic number, because the mean of its divisors is an integer number (1811040).

Almost surely, 2^63891612 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63891612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86929920).

63891612 is an abundant number, since it is smaller than the sum of its proper divisors (109968228).

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

63891612 is a wasteful number, since it uses less digits than its factorization.

63891612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 400 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 63891612 is about 7993.2228794148. Note that the first 3 decimals coincide. The cubic root of 63891612 is about 399.7740640731.

It can be divided in two parts, 6389 and 1612, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 63891612 in words is "sixty-three million, eight hundred ninety-one thousand, six hundred twelve".