7881349989 has 8 divisors (see below), whose sum is σ = 10511365792. Its totient is φ = 5252783760.

The previous prime is 7881349951. The next prime is 7881349997. The reversal of 7881349989 is 9899431887.

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

It is not a de Polignac number, because 7881349989 - 2¹¹ = 7881347941 is a prime.

It is a super-2 number, since 2×7881349989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881339989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349642 + ... + 371499.

It is an arithmetic number, because the mean of its divisors is an integer number (1313920724).

Almost surely, 2^7881349989 is an apocalyptic number.

It is an amenable number.

7881349989 is a deficient number, since it is larger than the sum of its proper divisors (2630015803).

7881349989 is a wasteful number, since it uses less digits than its factorization.

7881349989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724787.

The product of its digits is 31352832, while the sum is 66.

The square root of 7881349989 is about 88776.9676718010. The cubic root of 7881349989 is about 1990.0632109581.

The spelling of 7881349989 in words is "seven billion, eight hundred eighty-one million, three hundred forty-nine thousand, nine hundred eighty-nine".