742561 has 4 divisors (see below), whose sum is σ = 753712. Its totient is φ = 731412.

The previous prime is 742559. The next prime is 742579. The reversal of 742561 is 165247.

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 742561 - 2¹ = 742559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (742531) 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, 5475 + ... + 5608.

It is an arithmetic number, because the mean of its divisors is an integer number (188428).

2⁷⁴²⁵⁶¹ is an apocalyptic number.

It is an amenable number.

742561 is a deficient number, since it is larger than the sum of its proper divisors (11151).

742561 is a wasteful number, since it uses less digits than its factorization.

742561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11150.

The product of its digits is 1680, while the sum is 25.

The square root of 742561 is about 861.7197920438. The cubic root of 742561 is about 90.5546407514.

The spelling of 742561 in words is "seven hundred forty-two thousand, five hundred sixty-one".