78043987 has 8 divisors (see below), whose sum is σ = 90268416. Its totient is φ = 66088392.

The previous prime is 78043967. The next prime is 78043993. The reversal of 78043987 is 78934087.

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 78043987 - 2⁷ = 78043859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78043967) 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, 66583 + ... + 67744.

It is an arithmetic number, because the mean of its divisors is an integer number (11283552).

Almost surely, 2^78043987 is an apocalyptic number.

78043987 is a deficient number, since it is larger than the sum of its proper divisors (12224429).

78043987 is a wasteful number, since it uses less digits than its factorization.

78043987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134417.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 78043987 is about 8834.2507888332. The cubic root of 78043987 is about 427.3461699303.

The spelling of 78043987 in words is "seventy-eight million, forty-three thousand, nine hundred eighty-seven".