747047781 has 6 divisors (see below), whose sum is σ = 1079069030. Its totient is φ = 498031848.

The previous prime is 747047771. The next prime is 747047809. The reversal of 747047781 is 187740747.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 456890625 + 290157156 = 21375^2 + 17034^2 .

It is not a de Polignac number, because 747047781 - 2¹³ = 747039589 is a prime.

It is a super-2 number, since 2×747047781² = 1116160774194047922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747047771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41502646 + ... + 41502663.

Almost surely, 2^747047781 is an apocalyptic number.

It is an amenable number.

747047781 is a deficient number, since it is larger than the sum of its proper divisors (332021249).

747047781 is a wasteful number, since it uses less digits than its factorization.

747047781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83005315 (or 83005312 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 45.

The square root of 747047781 is about 27332.1748311399. The cubic root of 747047781 is about 907.3666092675.

The spelling of 747047781 in words is "seven hundred forty-seven million, forty-seven thousand, seven hundred eighty-one".