7155630720 has 672 divisors, whose sum is σ = 29930646420. Its totient is φ = 1630347264.

The previous prime is 7155630689. The next prime is 7155630773. The reversal of 7155630720 is 270365517.

7155630720 is a `hidden beast` number, since 7 + 1 + 556 + 30 + 72 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5946260544 + 1209370176 = 77112^2 + 34776^2 .

It is a tau number, because it is divible by the number of its divisors (672).

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

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 22861284 + ... + 22861596.

Almost surely, 2^7155630720 is an apocalyptic number.

7155630720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7155630720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14965323210).

7155630720 is an abundant number, since it is smaller than the sum of its proper divisors (22775015700).

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

7155630720 is an equidigital number, since it uses as much as digits as its factorization.

7155630720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 44100, while the sum is 36.

The square root of 7155630720 is about 84590.9612192698. The cubic root of 7155630720 is about 1927.0041056513.

The spelling of 7155630720 in words is "seven billion, one hundred fifty-five million, six hundred thirty thousand, seven hundred twenty".