747742565 has 4 divisors (see below), whose sum is σ = 897291084. Its totient is φ = 598194048.

The previous prime is 747742561. The next prime is 747742573. The reversal of 747742565 is 565247747.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 394340164 + 353402401 = 19858^2 + 18799^2 .

It is a cyclic number.

It is not a de Polignac number, because 747742565 - 2² = 747742561 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747742561) 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, 74774252 + ... + 74774261.

It is an arithmetic number, because the mean of its divisors is an integer number (224322771).

Almost surely, 2^747742565 is an apocalyptic number.

It is an amenable number.

747742565 is a deficient number, since it is larger than the sum of its proper divisors (149548519).

747742565 is a wasteful number, since it uses less digits than its factorization.

747742565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149548518.

The product of its digits is 1646400, while the sum is 47.

The square root of 747742565 is about 27344.8818794304. The cubic root of 747742565 is about 907.6478177254.

The spelling of 747742565 in words is "seven hundred forty-seven million, seven hundred forty-two thousand, five hundred sixty-five".