781043380 has 24 divisors (see below), whose sum is σ = 1766360232. Its totient is φ = 288385152.

The previous prime is 781043377. The next prime is 781043411. The reversal of 781043380 is 83340187.

It can be written as a sum of positive squares in 4 ways, for example, as 50098084 + 730945296 = 7078^2 + 27036^2 .

It is a super-2 number, since 2×781043380² = 1220057522883648800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1501747 + ... + 1502266.

It is an arithmetic number, because the mean of its divisors is an integer number (73598343).

Almost surely, 2^781043380 is an apocalyptic number.

It is an amenable number.

781043380 is an abundant number, since it is smaller than the sum of its proper divisors (985316852).

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

781043380 is a wasteful number, since it uses less digits than its factorization.

781043380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004035 (or 3004033 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 781043380 is about 27947.1533434087. The cubic root of 781043380 is about 920.9266734117.

The spelling of 781043380 in words is "seven hundred eighty-one million, forty-three thousand, three hundred eighty".