781320946 has 32 divisors (see below), whose sum is σ = 1354429440. Its totient is φ = 331117200.

The previous prime is 781320941. The next prime is 781320949. The reversal of 781320946 is 649023187.

It is a super-2 number, since 2×781320946² = 1220924841316669832, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 781320899 and 781320908.

It is not an unprimeable number, because it can be changed into a prime (781320941) 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 15 ways as a sum of consecutive naturals, for example, 604561 + ... + 605851.

It is an arithmetic number, because the mean of its divisors is an integer number (42325920).

Almost surely, 2^781320946 is an apocalyptic number.

781320946 is a deficient number, since it is larger than the sum of its proper divisors (573108494).

781320946 is a wasteful number, since it uses less digits than its factorization.

781320946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 781320946 is about 27952.1188105660. The cubic root of 781320946 is about 921.0357529948.

The spelling of 781320946 in words is "seven hundred eighty-one million, three hundred twenty thousand, nine hundred forty-six".