706138781 has 4 divisors (see below), whose sum is σ = 743304000. Its totient is φ = 668973564.

The previous prime is 706138753. The next prime is 706138793. The reversal of 706138781 is 187831607.

706138781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 706138781 - 2²⁶ = 639029917 is a prime.

It is a super-2 number, since 2×706138781² = 997263956064331922, 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 (706138681) 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, 18582581 + ... + 18582618.

It is an arithmetic number, because the mean of its divisors is an integer number (185826000).

Almost surely, 2^706138781 is an apocalyptic number.

It is an amenable number.

706138781 is a deficient number, since it is larger than the sum of its proper divisors (37165219).

706138781 is a wasteful number, since it uses less digits than its factorization.

706138781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37165218.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 706138781 is about 26573.2719287633. The cubic root of 706138781 is about 890.4919978856.

The spelling of 706138781 in words is "seven hundred six million, one hundred thirty-eight thousand, seven hundred eighty-one".