7621889985 has 24 divisors (see below), whose sum is σ = 13460549544. Its totient is φ = 3988308480.

The previous prime is 7621889981. The next prime is 7621889987. The reversal of 7621889985 is 5899881267.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2720769921 + 4901120064 = 52161^2 + 70008^2 .

It is not a de Polignac number, because 7621889985 - 2² = 7621889981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7621889981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1595496 + ... + 1600265.

It is an arithmetic number, because the mean of its divisors is an integer number (560856231).

Almost surely, 2^7621889985 is an apocalyptic number.

It is an amenable number.

7621889985 is a deficient number, since it is larger than the sum of its proper divisors (5838659559).

7621889985 is a wasteful number, since it uses less digits than its factorization.

7621889985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195825 (or 3195822 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 63.

The square root of 7621889985 is about 87303.4362725775. The cubic root of 7621889985 is about 1967.9809581057.

The spelling of 7621889985 in words is "seven billion, six hundred twenty-one million, eight hundred eighty-nine thousand, nine hundred eighty-five".