781980044 has 12 divisors (see below), whose sum is σ = 1401842568. Its totient is φ = 381453600.

The previous prime is 781980029. The next prime is 781980049. The reversal of 781980044 is 440089187.

It is a happy number.

It is a super-2 number, since 2×781980044² = 1222985578428483872, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 781979983 and 781980010.

It is not an unprimeable number, because it can be changed into a prime (781980049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2383922 + ... + 2384249.

It is an arithmetic number, because the mean of its divisors is an integer number (116820214).

Almost surely, 2^781980044 is an apocalyptic number.

It is an amenable number.

781980044 is a deficient number, since it is larger than the sum of its proper divisors (619862524).

781980044 is a wasteful number, since it uses less digits than its factorization.

781980044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768216 (or 4768214 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 781980044 is about 27963.9060933912. The cubic root of 781980044 is about 921.2946658904.

The spelling of 781980044 in words is "seven hundred eighty-one million, nine hundred eighty thousand, forty-four".