781380 has 48 divisors (see below), whose sum is σ = 2432640. Its totient is φ = 208224.

The previous prime is 781369. The next prime is 781387. The reversal of 781380 is 83187.

781380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×781380² = 1221109408800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (781387) by changing a digit.

781380 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184 + ... + 1263.

It is an arithmetic number, because the mean of its divisors is an integer number (50680).

2⁷⁸¹³⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 781380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1216320).

781380 is an abundant number, since it is smaller than the sum of its proper divisors (1651260).

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

781380 is a wasteful number, since it uses less digits than its factorization.

781380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1457 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 781380 is about 883.9570125295. The cubic root of 781380 is about 92.1058957064.

The spelling of 781380 in words is "seven hundred eighty-one thousand, three hundred eighty".