7188665428 has 48 divisors (see below), whose sum is σ = 15157941120. Its totient is φ = 2914095744.

The previous prime is 7188665417. The next prime is 7188665459. The reversal of 7188665428 is 8245668817.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 337050 + ... + 357742.

It is an arithmetic number, because the mean of its divisors is an integer number (315790440).

Almost surely, 2^7188665428 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 7188665428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7578970560).

7188665428 is an abundant number, since it is smaller than the sum of its proper divisors (7969275692).

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

7188665428 is a wasteful number, since it uses less digits than its factorization.

7188665428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21376 (or 21374 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 55.

The square root of 7188665428 is about 84785.9978298304. The cubic root of 7188665428 is about 1929.9649584231.

The spelling of 7188665428 in words is "seven billion, one hundred eighty-eight million, six hundred sixty-five thousand, four hundred twenty-eight".