7978089 has 8 divisors (see below), whose sum is σ = 12157120. Its totient is φ = 4558896.

The previous prime is 7978063. The next prime is 7978099. The reversal of 7978089 is 9808797.

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

It is not a de Polignac number, because 7978089 - 2⁷ = 7977961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7978099) 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, 189934 + ... + 189975.

It is an arithmetic number, because the mean of its divisors is an integer number (1519640).

Almost surely, 2^7978089 is an apocalyptic number.

It is an amenable number.

7978089 is a deficient number, since it is larger than the sum of its proper divisors (4179031).

7978089 is a wasteful number, since it uses less digits than its factorization.

7978089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379919.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 7978089 is about 2824.5511147791. The cubic root of 7978089 is about 199.8172413806.

The spelling of 7978089 in words is "seven million, nine hundred seventy-eight thousand, eighty-nine".