993228660 has 72 divisors (see below), whose sum is σ = 3015940200. Its totient is φ = 264584448.

The previous prime is 993228653. The next prime is 993228661. The reversal of 993228660 is 66822399.

It can be written as a sum of positive squares in 4 ways, for example, as 23155344 + 970073316 = 4812^2 + 31146^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993228661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216066 + ... + 220614.

Almost surely, 2^993228660 is an apocalyptic number.

993228660 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

993228660 is an abundant number, since it is smaller than the sum of its proper divisors (2022711540).

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

993228660 is a wasteful number, since it uses less digits than its factorization.

993228660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5777 (or 5772 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 993228660 is about 31515.5304572206. The cubic root of 993228660 is about 997.7377728541.

The spelling of 993228660 in words is "nine hundred ninety-three million, two hundred twenty-eight thousand, six hundred sixty".