7917320340 has 36 divisors (see below), whose sum is σ = 24015872244. Its totient is φ = 2111285376.

The previous prime is 7917320297. The next prime is 7917320353. The reversal of 7917320340 is 430237197.

It can be written as a sum of positive squares in 2 ways, for example, as 5221218564 + 2696101776 = 72258^2 + 51924^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×7917320340² (a number of 21 digits) contains 22 as substring.

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 = 7917320295 and 7917320304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21992377 + ... + 21992736.

Almost surely, 2^7917320340 is an apocalyptic number.

It is an amenable number.

7917320340 is an abundant number, since it is smaller than the sum of its proper divisors (16098551904).

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

7917320340 is a wasteful number, since it uses less digits than its factorization.

7917320340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43985128 (or 43985123 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 7917320340 is about 88979.3253514545. The cubic root of 7917320340 is about 1993.0861552496.

The spelling of 7917320340 in words is "seven billion, nine hundred seventeen million, three hundred twenty thousand, three hundred forty".