634816 has 56 divisors (see below), whose sum is σ = 1564640. Its totient is φ = 248832.

The previous prime is 634807. The next prime is 634817. The reversal of 634816 is 618436.

634816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634817) 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, 5770 + ... + 5878.

It is an arithmetic number, because the mean of its divisors is an integer number (27940).

2⁶³⁴⁸¹⁶ 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 634816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782320).

634816 is an abundant number, since it is smaller than the sum of its proper divisors (929824).

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

634816 is a wasteful number, since it uses less digits than its factorization.

634816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 131 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 634816 is about 796.7534122927. The cubic root of 634816 is about 85.9440775792.

The spelling of 634816 in words is "six hundred thirty-four thousand, eight hundred sixteen".