78997089 has 8 divisors (see below), whose sum is σ = 105568992. Its totient is φ = 52544960.

The previous prime is 78997067. The next prime is 78997103. The reversal of 78997089 is 98079987.

It is a happy number.

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 78997089 - 2⁸ = 78996833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78990089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28392 + ... + 31049.

It is an arithmetic number, because the mean of its divisors is an integer number (13196124).

Almost surely, 2^78997089 is an apocalyptic number.

It is an amenable number.

78997089 is a deficient number, since it is larger than the sum of its proper divisors (26571903).

78997089 is a wasteful number, since it uses less digits than its factorization.

78997089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59887.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 78997089 is about 8888.0306592631. The cubic root of 78997089 is about 429.0787723271.

The spelling of 78997089 in words is "seventy-eight million, nine hundred ninety-seven thousand, eighty-nine".