7155323280 has 480 divisors, whose sum is σ = 29066139648. Its totient is φ = 1542758400.

The previous prime is 7155323257. The next prime is 7155323333. The reversal of 7155323280 is 823235517.

It is a happy number.

7155323280 is a `hidden beast` number, since 7 + 1 + 55 + 323 + 280 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 95 ways as a sum of consecutive naturals, for example, 6405282 + ... + 6406398.

Almost surely, 2^7155323280 is an apocalyptic number.

7155323280 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 7155323280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14533069824).

7155323280 is an abundant number, since it is smaller than the sum of its proper divisors (21910816368).

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

7155323280 is a wasteful number, since it uses less digits than its factorization.

7155323280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 7155323280 is about 84589.1439843199. The cubic root of 7155323280 is about 1926.9765074959.

Adding to 7155323280 its reverse (823235517), we get a palindrome (7978558797).

The spelling of 7155323280 in words is "seven billion, one hundred fifty-five million, three hundred twenty-three thousand, two hundred eighty".