747991585 has 16 divisors (see below), whose sum is σ = 1036789632. Its totient is φ = 511993600.

The previous prime is 747991583. The next prime is 747991589. The reversal of 747991585 is 585199747.

It is a happy number.

It is not a de Polignac number, because 747991585 - 2¹ = 747991583 is a prime.

It is a super-2 number, since 2×747991585² = 1118982822461624450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (747991583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399061 + ... + 400930.

It is an arithmetic number, because the mean of its divisors is an integer number (64799352).

Almost surely, 2^747991585 is an apocalyptic number.

It is an amenable number.

747991585 is a deficient number, since it is larger than the sum of its proper divisors (288798047).

747991585 is a wasteful number, since it uses less digits than its factorization.

747991585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800024.

The product of its digits is 3175200, while the sum is 55.

The square root of 747991585 is about 27349.4348204858. The cubic root of 747991585 is about 907.7485642408.

The spelling of 747991585 in words is "seven hundred forty-seven million, nine hundred ninety-one thousand, five hundred eighty-five".