780666087 has 32 divisors (see below), whose sum is σ = 1097072640. Its totient is φ = 493164000.

The previous prime is 780666083. The next prime is 780666101.

780666087 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 780666087 - 2² = 780666083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780666083) 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 31 ways as a sum of consecutive naturals, for example, 1260864 + ... + 1261482.

It is an arithmetic number, because the mean of its divisors is an integer number (34283520).

Almost surely, 2^780666087 is an apocalyptic number.

780666087 is a deficient number, since it is larger than the sum of its proper divisors (316406553).

780666087 is a wasteful number, since it uses less digits than its factorization.

780666087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915.

The product of its (nonzero) digits is 677376, while the sum is 48.

The square root of 780666087 is about 27940.4024129933. The cubic root of 780666087 is about 920.7783610561.

The spelling of 780666087 in words is "seven hundred eighty million, six hundred sixty-six thousand, eighty-seven".