7949785820 has 96 divisors (see below), whose sum is σ = 19040313600. Its totient is φ = 2769306624.

The previous prime is 7949785819. The next prime is 7949785829. The reversal of 7949785820 is 285879497.

It is a self number, because there is not a number n which added to its sum of digits gives 7949785820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7949785829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263471 + ... + 292089.

It is an arithmetic number, because the mean of its divisors is an integer number (198336600).

Almost surely, 2^7949785820 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 7949785820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9520156800).

7949785820 is an abundant number, since it is smaller than the sum of its proper divisors (11090527780).

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

7949785820 is a wasteful number, since it uses less digits than its factorization.

7949785820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28707 (or 28705 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 59.

The square root of 7949785820 is about 89161.5714307459. The cubic root of 7949785820 is about 1995.8066992590.

The spelling of 7949785820 in words is "seven billion, nine hundred forty-nine million, seven hundred eighty-five thousand, eight hundred twenty".