781048044 has 144 divisors (see below), whose sum is σ = 2357555200. Its totient is φ = 217818720.

The previous prime is 781048043. The next prime is 781048139. The reversal of 781048044 is 440840187.

It is a happy number.

It is a super-2 number, since 2×781048044² = 1220072094072451872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (781048043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 530229 + ... + 531699.

Almost surely, 2^781048044 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 781048044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1178777600).

781048044 is an abundant number, since it is smaller than the sum of its proper divisors (1576507156).

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

781048044 is a wasteful number, since it uses less digits than its factorization.

781048044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 781048044 is about 27947.2367864875. The cubic root of 781048044 is about 920.9285065124.

The spelling of 781048044 in words is "seven hundred eighty-one million, forty-eight thousand, forty-four".