780891223 has 16 divisors (see below), whose sum is σ = 915819520. Its totient is φ = 651895776.

The previous prime is 780891211. The next prime is 780891227. The reversal of 780891223 is 322198087.

It is not a de Polignac number, because 780891223 - 2²⁹ = 244020311 is a prime.

It is a super-2 number, since 2×780891223² = 1219582204316871458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780891227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106933 + ... + 114001.

It is an arithmetic number, because the mean of its divisors is an integer number (57238720).

Almost surely, 2^780891223 is an apocalyptic number.

780891223 is a deficient number, since it is larger than the sum of its proper divisors (134928297).

780891223 is a wasteful number, since it uses less digits than its factorization.

780891223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7486.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 780891223 is about 27944.4309836504. The cubic root of 780891223 is about 920.8668668573.

The spelling of 780891223 in words is "seven hundred eighty million, eight hundred ninety-one thousand, two hundred twenty-three".