7191356640 has 384 divisors, whose sum is σ = 25787704320. Its totient is φ = 1671217152.

The previous prime is 7191356621. The next prime is 7191356647. The reversal of 7191356640 is 466531917.

It is a super-2 number, since 2×7191356640² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7191356592 and 7191356601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7191356647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12772999 + ... + 12773561.

It is an arithmetic number, because the mean of its divisors is an integer number (67155480).

Almost surely, 2^7191356640 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 7191356640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12893852160).

7191356640 is an abundant number, since it is smaller than the sum of its proper divisors (18596347680).

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

7191356640 is a wasteful number, since it uses less digits than its factorization.

7191356640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 7191356640 is about 84801.8669605805. The cubic root of 7191356640 is about 1930.2057679258.

The spelling of 7191356640 in words is "seven billion, one hundred ninety-one million, three hundred fifty-six thousand, six hundred forty".