7891485890 has 8 divisors (see below), whose sum is σ = 14204674620. Its totient is φ = 3156594352.

The previous prime is 7891485883. The next prime is 7891485893. The reversal of 7891485890 is 985841987.

It can be written as a sum of positive squares in 2 ways, for example, as 7154960569 + 736525321 = 84587^2 + 27139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7891485893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394574285 + ... + 394574304.

Almost surely, 2^7891485890 is an apocalyptic number.

7891485890 is a deficient number, since it is larger than the sum of its proper divisors (6313188730).

7891485890 is a wasteful number, since it uses less digits than its factorization.

7891485890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789148596.

The product of its (nonzero) digits is 5806080, while the sum is 59.

The square root of 7891485890 is about 88834.0356507572. The cubic root of 7891485890 is about 1990.9159600771.

The spelling of 7891485890 in words is "seven billion, eight hundred ninety-one million, four hundred eighty-five thousand, eight hundred ninety".