6631820 has 48 divisors (see below), whose sum is σ = 15664320. Its totient is φ = 2340096.

The previous prime is 6631789. The next prime is 6631871. The reversal of 6631820 is 281366.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 6631820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5426 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (326340).

Almost surely, 2^6631820 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 6631820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7832160).

6631820 is an abundant number, since it is smaller than the sum of its proper divisors (9032500).

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

6631820 is a wasteful number, since it uses less digits than its factorization.

6631820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 6631820 is about 2575.2320283811. The cubic root of 6631820 is about 187.8787130777.

The spelling of 6631820 in words is "six million, six hundred thirty-one thousand, eight hundred twenty".