7091491680 has 720 divisors, whose sum is σ = 31389074640. Its totient is φ = 1494484992.

The previous prime is 7091491601. The next prime is 7091491717. The reversal of 7091491680 is 861941907.

It is a happy number.

7091491680 is a `hidden beast` number, since 70 + 91 + 491 + 6 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 8255091 + ... + 8255949.

It is an arithmetic number, because the mean of its divisors is an integer number (43595937).

Almost surely, 2^7091491680 is an apocalyptic number.

7091491680 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 7091491680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15694537320).

7091491680 is an abundant number, since it is smaller than the sum of its proper divisors (24297582960).

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

7091491680 is a wasteful number, since it uses less digits than its factorization.

7091491680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 7091491680 is about 84210.9950065904. The cubic root of 7091491680 is about 1921.2292908966.

The spelling of 7091491680 in words is "seven billion, ninety-one million, four hundred ninety-one thousand, six hundred eighty".