7975813540 has 48 divisors (see below), whose sum is σ = 17709995520. Its totient is φ = 3008828160.

The previous prime is 7975813519. The next prime is 7975813541. The reversal of 7975813540 is 453185797.

It is a happy number.

It is a super-2 number, since 2×7975813540² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7975813541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37680 + ... + 131800.

It is an arithmetic number, because the mean of its divisors is an integer number (368958240).

Almost surely, 2^7975813540 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 7975813540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8854997760).

7975813540 is an abundant number, since it is smaller than the sum of its proper divisors (9734181980).

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

7975813540 is a wasteful number, since it uses less digits than its factorization.

7975813540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94372 (or 94370 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 7975813540 is about 89307.4103308342. The cubic root of 7975813540 is about 1997.9824270508.

The spelling of 7975813540 in words is "seven billion, nine hundred seventy-five million, eight hundred thirteen thousand, five hundred forty".