781049904 has 40 divisors (see below), whose sum is σ = 2136403440. Its totient is φ = 245035008.

The previous prime is 781049881. The next prime is 781049977. The reversal of 781049904 is 409940187.

It is a super-2 number, since 2×781049904² = 1220077905076818432, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 477769 + ... + 479400.

It is an arithmetic number, because the mean of its divisors is an integer number (53410086).

Almost surely, 2^781049904 is an apocalyptic number.

It is an amenable number.

781049904 is an abundant number, since it is smaller than the sum of its proper divisors (1355353536).

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

781049904 is a wasteful number, since it uses less digits than its factorization.

781049904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957197 (or 957191 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 781049904 is about 27947.2700634606. The cubic root of 781049904 is about 920.9292375497.

The spelling of 781049904 in words is "seven hundred eighty-one million, forty-nine thousand, nine hundred four".