6666624 has 80 divisors (see below), whose sum is σ = 19870620. Its totient is φ = 2218752.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666624 is 4266666.

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

It is a nude number because it is divisible by every one of its digits.

Its product of digits (62208) is a multiple of the sum of its prime divisors (648).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10047 + ... + 10689.

Almost surely, 2^6666624 is an apocalyptic number.

6666624 is a gapful number since it is divisible by the number (64) 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 6666624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9935310).

6666624 is an abundant number, since it is smaller than the sum of its proper divisors (13203996).

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

6666624 is an equidigital number, since it uses as much as digits as its factorization.

6666624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 648 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 6666624 is about 2581.9806350939. The cubic root of 6666624 is about 188.2068042666.

It can be divided in two parts, 666662 and 4, that added together give a palindrome (666666).

The spelling of 6666624 in words is "six million, six hundred sixty-six thousand, six hundred twenty-four".