8278640989 has 8 divisors (see below), whose sum is σ = 8366760000. Its totient is φ = 8190987552.

The previous prime is 8278640983. The next prime is 8278641013. The reversal of 8278640989 is 9890468728.

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

It is a cyclic number.

It is not a de Polignac number, because 8278640989 - 2⁵ = 8278640957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8278640983) 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, 80584 + ... + 151825.

It is an arithmetic number, because the mean of its divisors is an integer number (1045845000).

Almost surely, 2^8278640989 is an apocalyptic number.

It is an amenable number.

8278640989 is a deficient number, since it is larger than the sum of its proper divisors (88119011).

8278640989 is a wasteful number, since it uses less digits than its factorization.

8278640989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232787.

The product of its (nonzero) digits is 13934592, while the sum is 61.

The square root of 8278640989 is about 90987.0374778737. The cubic root of 8278640989 is about 2022.9555946973.

The spelling of 8278640989 in words is "eight billion, two hundred seventy-eight million, six hundred forty thousand, nine hundred eighty-nine".