623809836 has 120 divisors (see below), whose sum is σ = 1817119920. Its totient is φ = 185286528.

The previous prime is 623809831. The next prime is 623809861. The reversal of 623809836 is 638908326.

It is a super-2 number, since 2×623809836² = 778277422980693792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 623809791 and 623809800.

It is not an unprimeable number, because it can be changed into a prime (623809831) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119595 + ... + 124701.

It is an arithmetic number, because the mean of its divisors is an integer number (15142666).

Almost surely, 2^623809836 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 623809836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (908559960).

623809836 is an abundant number, since it is smaller than the sum of its proper divisors (1193310084).

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

623809836 is a wasteful number, since it uses less digits than its factorization.

623809836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5165 (or 5154 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 623809836 is about 24976.1853772749. The cubic root of 623809836 is about 854.4449213378. Note that the first 3 decimals are identical.

The spelling of 623809836 in words is "six hundred twenty-three million, eight hundred nine thousand, eight hundred thirty-six".