780988 has 24 divisors (see below), whose sum is σ = 1538208. Its totient is φ = 344256.

The previous prime is 780973. The next prime is 780991. The reversal of 780988 is 889087.

It is a super-2 number, since 2×780988² = 1219884512288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 780988.

It is a congruent number.

It is an unprimeable number.

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, 870 + ... + 1522.

It is an arithmetic number, because the mean of its divisors is an integer number (64092).

2⁷⁸⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

780988 is a deficient number, since it is larger than the sum of its proper divisors (757220).

780988 is a wasteful number, since it uses less digits than its factorization.

780988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 780988 is about 883.7352544739. The cubic root of 780988 is about 92.0904906749.

The spelling of 780988 in words is "seven hundred eighty thousand, nine hundred eighty-eight".