749344728609 has 27 divisors (see below), whose sum is σ = 1124065167537. Its totient is φ = 499516407468.

The previous prime is 749344728557. The next prime is 749344728619. The reversal of 749344728609 is 906827443947.

The square root of 749344728609 is 865647.

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

749344728609 is a `hidden beast` number, since 7 + 4 + 9 + 344 + 7 + 286 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 749344728609 - 2¹¹ = 749344726561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (749344728619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 70112064 + ... + 70122750.

Almost surely, 2^749344728609 is an apocalyptic number.

749344728609 is the 865647-th square number.

749344728609 is the 432824-th centered octagonal number.

It is an amenable number.

749344728609 is a deficient number, since it is larger than the sum of its proper divisors (374720438928).

749344728609 is an frugal number, since it uses more digits than its factorization.

749344728609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21398 (or 10690 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

The spelling of 749344728609 in words is "seven hundred forty-nine billion, three hundred forty-four million, seven hundred twenty-eight thousand, six hundred nine".