7220491128 has 96 divisors (see below), whose sum is σ = 19743750000. Its totient is φ = 2383761408.

The previous prime is 7220491123. The next prime is 7220491129. The reversal of 7220491128 is 8211940227.

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

It is a junction number, because it is equal to n+sod(n) for n = 7220491092 and 7220491101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220491121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4816123 + ... + 4817621.

Almost surely, 2^7220491128 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 7220491128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9871875000).

7220491128 is an abundant number, since it is smaller than the sum of its proper divisors (12523258872).

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

7220491128 is a wasteful number, since it uses less digits than its factorization.

7220491128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 7220491128 is about 84973.4730842514. The cubic root of 7220491128 is about 1932.8088829018.

The spelling of 7220491128 in words is "seven billion, two hundred twenty million, four hundred ninety-one thousand, one hundred twenty-eight".