742645 has 8 divisors (see below), whose sum is σ = 943704. Its totient is φ = 559104.

The previous prime is 742619. The next prime is 742657. The reversal of 742645 is 546247.

742645 = 268² + 269² + ... + 277².

It can be written as a sum of positive squares in 4 ways, for example, as 116964 + 625681 = 342^2 + 791^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 742645 - 2¹⁹ = 218357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4284 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (117963).

2⁷⁴²⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

742645 is a deficient number, since it is larger than the sum of its proper divisors (201059).

742645 is a wasteful number, since it uses less digits than its factorization.

742645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759.

The product of its digits is 6720, while the sum is 28.

The square root of 742645 is about 861.7685304071. The cubic root of 742645 is about 90.5580551973.

The spelling of 742645 in words is "seven hundred forty-two thousand, six hundred forty-five".