781145446 has 16 divisors (see below), whose sum is σ = 1179885600. Its totient is φ = 387858240.

The previous prime is 781145441. The next prime is 781145473. The reversal of 781145446 is 644541187.

It is a super-2 number, since 2×781145446² = 1220376415613077832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 781145399 and 781145408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781145441) 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 7 ways as a sum of consecutive naturals, for example, 243976 + ... + 247156.

It is an arithmetic number, because the mean of its divisors is an integer number (73742850).

Almost surely, 2^781145446 is an apocalyptic number.

781145446 is a deficient number, since it is larger than the sum of its proper divisors (398740154).

781145446 is a wasteful number, since it uses less digits than its factorization.

781145446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999.

The product of its digits is 107520, while the sum is 40.

The square root of 781145446 is about 27948.9793373568. The cubic root of 781145446 is about 920.9667869360.

The spelling of 781145446 in words is "seven hundred eighty-one million, one hundred forty-five thousand, four hundred forty-six".