78922987 has 8 divisors (see below), whose sum is σ = 92720880. Its totient is φ = 66228960.

The previous prime is 78922973. The next prime is 78922997.

78922987 is nontrivially palindromic in base 10.

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 78922987 - 2⁷ = 78922859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78922927) 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, 275812 + ... + 276097.

It is an arithmetic number, because the mean of its divisors is an integer number (11590110).

Almost surely, 2^78922987 is an apocalyptic number.

78922987 is a deficient number, since it is larger than the sum of its proper divisors (13797893).

78922987 is a wasteful number, since it uses less digits than its factorization.

78922987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551933.

The product of its digits is 1016064, while the sum is 52.

The square root of 78922987 is about 8883.8610412365. The cubic root of 78922987 is about 428.9445667821.

The spelling of 78922987 in words is "seventy-eight million, nine hundred twenty-two thousand, nine hundred eighty-seven".