742723681 has 32 divisors (see below), whose sum is σ = 892821248. Its totient is φ = 604661760.

The previous prime is 742723679. The next prime is 742723691. The reversal of 742723681 is 186327247.

It is a 10-Lehmer number, since φ(742723681) divides (742723681-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 742723681 - 2¹ = 742723679 is a prime.

It is a super-2 number, since 2×742723681² = 1103276932636379522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (742723691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3081721 + ... + 3081961.

It is an arithmetic number, because the mean of its divisors is an integer number (27900664).

It is the magic constant of a 1141 × 1141 magic square.

Almost surely, 2^742723681 is an apocalyptic number.

It is an amenable number.

742723681 is a deficient number, since it is larger than the sum of its proper divisors (150097567).

742723681 is a wasteful number, since it uses less digits than its factorization.

742723681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521.

The product of its digits is 112896, while the sum is 40.

The square root of 742723681 is about 27252.9572890723. The cubic root of 742723681 is about 905.6125320206.

The spelling of 742723681 in words is "seven hundred forty-two million, seven hundred twenty-three thousand, six hundred eighty-one".