781500068 has 6 divisors (see below), whose sum is σ = 1367625126. Its totient is φ = 390750032.

The previous prime is 781500061. The next prime is 781500089. The reversal of 781500068 is 860005187.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 461734144 + 319765924 = 21488^2 + 17882^2 .

It is a super-2 number, since 2×781500068² = 1221484712568009248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (781500061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97687505 + ... + 97687512.

It is an arithmetic number, because the mean of its divisors is an integer number (227937521).

Almost surely, 2^781500068 is an apocalyptic number.

It is an amenable number.

781500068 is a deficient number, since it is larger than the sum of its proper divisors (586125058).

781500068 is a wasteful number, since it uses less digits than its factorization.

781500068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195375021 (or 195375019 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 781500068 is about 27955.3227132151. The cubic root of 781500068 is about 921.1061317387.

The spelling of 781500068 in words is "seven hundred eighty-one million, five hundred thousand, sixty-eight".