78043989 has 16 divisors (see below), whose sum is σ = 107454272. Its totient is φ = 50347008.

The previous prime is 78043967. The next prime is 78043993. The reversal of 78043989 is 98934087.

It is not a de Polignac number, because 78043989 - 2¹² = 78039893 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 (78042989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19602 + ... + 23244.

It is an arithmetic number, because the mean of its divisors is an integer number (6715892).

Almost surely, 2^78043989 is an apocalyptic number.

It is an amenable number.

78043989 is a deficient number, since it is larger than the sum of its proper divisors (29410283).

78043989 is a wasteful number, since it uses less digits than its factorization.

78043989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 78043989 is about 8834.2509020290. The cubic root of 78043989 is about 427.3461735807.

The spelling of 78043989 in words is "seventy-eight million, forty-three thousand, nine hundred eighty-nine".