781964 has 12 divisors (see below), whose sum is σ = 1440600. Its totient is φ = 370368.

The previous prime is 781961. The next prime is 781967. The reversal of 781964 is 469187.

It is an interprime number because it is at equal distance from previous prime (781961) and next prime (781967).

It is a super-2 number, since 2×781964² = 1222935394592, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 781964.

It is not an unprimeable number, because it can be changed into a prime (781961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5069 + ... + 5220.

It is an arithmetic number, because the mean of its divisors is an integer number (120050).

2⁷⁸¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

781964 is a deficient number, since it is larger than the sum of its proper divisors (658636).

781964 is a wasteful number, since it uses less digits than its factorization.

781964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10312 (or 10310 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 781964 is about 884.2872836358. The cubic root of 781964 is about 92.1288365068.

The spelling of 781964 in words is "seven hundred eighty-one thousand, nine hundred sixty-four".