7981001898 has 32 divisors (see below), whose sum is σ = 16958712960. Its totient is φ = 2499174720.

The previous prime is 7981001887. The next prime is 7981001923. The reversal of 7981001898 is 8981001897.

It is a self number, because there is not a number n which added to its sum of digits gives 7981001898.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613398 + ... + 626273.

It is an arithmetic number, because the mean of its divisors is an integer number (529959780).

Almost surely, 2^7981001898 is an apocalyptic number.

7981001898 is an abundant number, since it is smaller than the sum of its proper divisors (8977711062).

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

7981001898 is a wasteful number, since it uses less digits than its factorization.

7981001898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239742.

The product of its (nonzero) digits is 290304, while the sum is 51.

The square root of 7981001898 is about 89336.4533547197. The cubic root of 7981001898 is about 1998.4155699555.

Subtracting 7981001898 from its reverse (8981001897), we obtain a palindrome (999999999).

The spelling of 7981001898 in words is "seven billion, nine hundred eighty-one million, one thousand, eight hundred ninety-eight".