863633408 has 72 divisors (see below), whose sum is σ = 1887429600. Its totient is φ = 391905280.

The previous prime is 863633387. The next prime is 863633423. The reversal of 863633408 is 804336368.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1441493 + ... + 1442091.

It is an arithmetic number, because the mean of its divisors is an integer number (26214300).

Almost surely, 2^863633408 is an apocalyptic number.

863633408 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863633408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943714800).

863633408 is an abundant number, since it is smaller than the sum of its proper divisors (1023796192).

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

863633408 is an frugal number, since it uses more digits than its factorization.

863633408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The square root of 863633408 is about 29387.6403952410. The cubic root of 863633408 is about 952.3059064473.

The spelling of 863633408 in words is "eight hundred sixty-three million, six hundred thirty-three thousand, four hundred eight".