781811982 has 48 divisors (see below), whose sum is σ = 1980950400. Its totient is φ = 218178576.

The previous prime is 781811977. The next prime is 781811993. The reversal of 781811982 is 289118187.

It is a happy number.

It is a super-2 number, since 2×781811982² = 1222459950397536648, which contains 22 as substring.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 66732 + ... + 77567.

It is an arithmetic number, because the mean of its divisors is an integer number (41269800).

Almost surely, 2^781811982 is an apocalyptic number.

781811982 is an abundant number, since it is smaller than the sum of its proper divisors (1199138418).

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

781811982 is a wasteful number, since it uses less digits than its factorization.

781811982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144357 (or 144354 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The square root of 781811982 is about 27960.9009511496. The cubic root of 781811982 is about 921.2286600638.

The spelling of 781811982 in words is "seven hundred eighty-one million, eight hundred eleven thousand, nine hundred eighty-two".