742072081 has 3 divisors (see below), whose sum is σ = 742099323. Its totient is φ = 742044840.

The previous prime is 742072063. The next prime is 742072091. The reversal of 742072081 is 180270247.

The square root of 742072081 is 27241.

It is a perfect power (a square), and thus also a powerful number.

742072081 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 brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 740329681 + 1742400 = 27209^2 + 1320^2 .

It is a de Polignac number, because none of the positive numbers 2^k-742072081 is a prime.

It is a super-2 number, since 2×742072081² = 1101341946799341122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742072021) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13621 + ... + 40861.

It is an arithmetic number, because the mean of its divisors is an integer number (247366441).

Almost surely, 2^742072081 is an apocalyptic number.

742072081 is the 27241-st square number.

742072081 is the 13621-st centered octagonal number.

It is an amenable number.

742072081 is a deficient number, since it is larger than the sum of its proper divisors (27242).

742072081 is an frugal number, since it uses more digits than its factorization.

742072081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54482 (or 27241 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The cubic root of 742072081 is about 905.3476197832.

The spelling of 742072081 in words is "seven hundred forty-two million, seventy-two thousand, eighty-one".