7642730581 has 4 divisors (see below), whose sum is σ = 7644257152. Its totient is φ = 7641204012.

The previous prime is 7642730569. The next prime is 7642730609. The reversal of 7642730581 is 1850372467.

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 7642730581 - 2¹³ = 7642722389 is a prime.

It is a super-2 number, since 2×7642730581² (a number of 21 digits) 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 (7642730561) 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, 755751 + ... + 765796.

It is an arithmetic number, because the mean of its divisors is an integer number (1911064288).

Almost surely, 2^7642730581 is an apocalyptic number.

It is an amenable number.

7642730581 is a deficient number, since it is larger than the sum of its proper divisors (1526571).

7642730581 is a wasteful number, since it uses less digits than its factorization.

7642730581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526570.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 7642730581 is about 87422.7120432671. The cubic root of 7642730581 is about 1969.7730145511.

The spelling of 7642730581 in words is "seven billion, six hundred forty-two million, seven hundred thirty thousand, five hundred eighty-one".