780085987 has 4 divisors (see below), whose sum is σ = 825973416. Its totient is φ = 734198560.

The previous prime is 780085973. The next prime is 780085997. The reversal of 780085987 is 789580087.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780085987 is a prime.

It is a super-3 number, since 3×780085987³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780085997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22943689 + ... + 22943722.

It is an arithmetic number, because the mean of its divisors is an integer number (206493354).

Almost surely, 2^780085987 is an apocalyptic number.

780085987 is a deficient number, since it is larger than the sum of its proper divisors (45887429).

780085987 is a wasteful number, since it uses less digits than its factorization.

780085987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45887428.

The product of its (nonzero) digits is 1128960, while the sum is 52.

The square root of 780085987 is about 27930.0194593559. The cubic root of 780085987 is about 920.5502328396.

The spelling of 780085987 in words is "seven hundred eighty million, eighty-five thousand, nine hundred eighty-seven".