6618990 has 64 divisors (see below), whose sum is σ = 18602496. Its totient is φ = 1475712.

The previous prime is 6618979. The next prime is 6618991. The reversal of 6618990 is 998166.

It is a super-2 number, since 2×6618990² = 87622057240200, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8664 + ... + 9396.

It is an arithmetic number, because the mean of its divisors is an integer number (290664).

Almost surely, 2^6618990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6618990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9301248).

6618990 is an abundant number, since it is smaller than the sum of its proper divisors (11983506).

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

6618990 is a wasteful number, since it uses less digits than its factorization.

6618990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 6618990 is about 2572.7397847431. The cubic root of 6618990 is about 187.7574773781.

The spelling of 6618990 in words is "six million, six hundred eighteen thousand, nine hundred ninety".