781480 has 32 divisors (see below), whose sum is σ = 2010240. Its totient is φ = 267840.

The previous prime is 781453. The next prime is 781481. The reversal of 781480 is 84187.

It is a super-3 number, since 3×781480³ = 1431775274333376000, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (781481) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 1675.

It is an arithmetic number, because the mean of its divisors is an integer number (62820).

2⁷⁸¹⁴⁸⁰ is an apocalyptic number.

781480 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

781480 is an abundant number, since it is smaller than the sum of its proper divisors (1228760).

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

781480 is a wasteful number, since it uses less digits than its factorization.

781480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2809 (or 2805 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 781480 is about 884.0135745564. The cubic root of 781480 is about 92.1098247365.

It can be divided in two parts, 78 and 1480, that multiplied together give a triangular number (115440 = T₄₈₀).

The spelling of 781480 in words is "seven hundred eighty-one thousand, four hundred eighty".