782121668 has 12 divisors (see below), whose sum is σ = 1400543760. Its totient is φ = 381966312.

The previous prime is 782121667. The next prime is 782121713. The reversal of 782121668 is 866121287.

It is a super-2 number, since 2×782121668² = 1223428607110204448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (782121667) 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, 2273438 + ... + 2273781.

It is an arithmetic number, because the mean of its divisors is an integer number (116711980).

Almost surely, 2^782121668 is an apocalyptic number.

It is an amenable number.

782121668 is a deficient number, since it is larger than the sum of its proper divisors (618422092).

782121668 is a wasteful number, since it uses less digits than its factorization.

782121668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547266 (or 4547264 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 782121668 is about 27966.4382430084. The cubic root of 782121668 is about 921.3502809327.

The spelling of 782121668 in words is "seven hundred eighty-two million, one hundred twenty-one thousand, six hundred sixty-eight".