7991549100 has 180 divisors, whose sum is σ = 25958510424. Its totient is φ = 2126718720.

The previous prime is 7991549087. The next prime is 7991549107. The reversal of 7991549100 is 19451997.

7991549100 is a `hidden beast` number, since 7 + 9 + 91 + 549 + 10 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

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

It is not an unprimeable number, because it can be changed into a prime (7991549107) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 6698104 + ... + 6699296.

Almost surely, 2^7991549100 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 7991549100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12979255212).

7991549100 is an abundant number, since it is smaller than the sum of its proper divisors (17966961324).

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

7991549100 is a wasteful number, since it uses less digits than its factorization.

7991549100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046 (or 2030 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 45.

The square root of 7991549100 is about 89395.4646500593. The cubic root of 7991549100 is about 1999.2955102095.

The spelling of 7991549100 in words is "seven billion, nine hundred ninety-one million, five hundred forty-nine thousand, one hundred".