747668081 has 4 divisors (see below), whose sum is σ = 749641200. Its totient is φ = 745694964.

The previous prime is 747668071. The next prime is 747668083. The reversal of 747668081 is 180866747.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180866747 = 1979 ⋅91393.

It is a cyclic number.

It is not a de Polignac number, because 747668081 - 2¹⁸ = 747405937 is a prime.

It is a super-2 number, since 2×747668081² = 1118015118692445122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747668083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985991 + ... + 986748.

It is an arithmetic number, because the mean of its divisors is an integer number (187410300).

Almost surely, 2^747668081 is an apocalyptic number.

It is an amenable number.

747668081 is a deficient number, since it is larger than the sum of its proper divisors (1973119).

747668081 is a wasteful number, since it uses less digits than its factorization.

747668081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973118.

The product of its (nonzero) digits is 451584, while the sum is 47.

The square root of 747668081 is about 27343.5199087462. The cubic root of 747668081 is about 907.6176792401.

It can be divided in two parts, 7476 and 68081, that added together give a palindrome (75557).

The spelling of 747668081 in words is "seven hundred forty-seven million, six hundred sixty-eight thousand, eighty-one".