78032987 has 4 divisors (see below), whose sum is σ = 79355640. Its totient is φ = 76710336.

The previous prime is 78032959. The next prime is 78032989. The reversal of 78032987 is 78923087.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78032987 - 2⁶ = 78032923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78032989) 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 3 ways as a sum of consecutive naturals, for example, 661238 + ... + 661355.

It is an arithmetic number, because the mean of its divisors is an integer number (19838910).

Almost surely, 2^78032987 is an apocalyptic number.

78032987 is a deficient number, since it is larger than the sum of its proper divisors (1322653).

78032987 is a wasteful number, since it uses less digits than its factorization.

78032987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322652.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 78032987 is about 8833.6281900474. The cubic root of 78032987 is about 427.3260913869.

The spelling of 78032987 in words is "seventy-eight million, thirty-two thousand, nine hundred eighty-seven".