781326 has 80 divisors (see below), whose sum is σ = 2195424. Its totient is φ = 202176.

The previous prime is 781321. The next prime is 781327. The reversal of 781326 is 623187.

It is a super-2 number, since 2×781326² = 1220940636552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 781326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781321) by changing a digit.

781326 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14716 + ... + 14768.

2⁷⁸¹³²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 781326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097712).

781326 is an abundant number, since it is smaller than the sum of its proper divisors (1414098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781326 is a wasteful number, since it uses less digits than its factorization.

781326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 78 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 781326 is about 883.9264675300. The cubic root of 781326 is about 92.1037738907.

The spelling of 781326 in words is "seven hundred eighty-one thousand, three hundred twenty-six".