6628990231 has 4 divisors (see below), whose sum is σ = 6737662264. Its totient is φ = 6520318200.

The previous prime is 6628990219. The next prime is 6628990273. The reversal of 6628990231 is 1320998266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6628990231 is a prime.

It is a super-2 number, since 2×6628990231² = 87887022965386866722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628990031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54335925 + ... + 54336046.

It is an arithmetic number, because the mean of its divisors is an integer number (1684415566).

Almost surely, 2^6628990231 is an apocalyptic number.

6628990231 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6628990231 is a deficient number, since it is larger than the sum of its proper divisors (108672033).

6628990231 is a wasteful number, since it uses less digits than its factorization.

6628990231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108672032.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 6628990231 is about 81418.6110849356. The cubic root of 6628990231 is about 1878.5198693040.

It can be divided in two parts, 66289 and 90231, that added together give a triangular number (156520 = T₅₅₉).

The spelling of 6628990231 in words is "six billion, six hundred twenty-eight million, nine hundred ninety thousand, two hundred thirty-one".