780254987 has 4 divisors (see below), whose sum is σ = 783222000. Its totient is φ = 777287976.

The previous prime is 780254977. The next prime is 780255011. The reversal of 780254987 is 789452087.

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 780254987 - 2²⁰ = 779206411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780254957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483112 + ... + 1483637.

It is an arithmetic number, because the mean of its divisors is an integer number (195805500).

Almost surely, 2^780254987 is an apocalyptic number.

780254987 is a deficient number, since it is larger than the sum of its proper divisors (2967013).

780254987 is a wasteful number, since it uses less digits than its factorization.

780254987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967012.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The square root of 780254987 is about 27933.0447141016. The cubic root of 780254987 is about 920.6167048947.

The spelling of 780254987 in words is "seven hundred eighty million, two hundred fifty-four thousand, nine hundred eighty-seven".