738721685 has 16 divisors (see below), whose sum is σ = 972672624. Its totient is φ = 535222272.

The previous prime is 738721679. The next prime is 738721693. The reversal of 738721685 is 586127837.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 36312676 + 702409009 = 6026^2 + 26503^2 .

It is not a de Polignac number, because 738721685 - 2¹⁸ = 738459541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103772 + ... + 110661.

It is an arithmetic number, because the mean of its divisors is an integer number (60792039).

Almost surely, 2^738721685 is an apocalyptic number.

It is an amenable number.

738721685 is a deficient number, since it is larger than the sum of its proper divisors (233950939).

738721685 is a wasteful number, since it uses less digits than its factorization.

738721685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214504.

The product of its digits is 564480, while the sum is 47.

The square root of 738721685 is about 27179.4349646934. The cubic root of 738721685 is about 903.9830400693.

It can be divided in two parts, 73872 and 1685, that added together give a palindrome (75557).

The spelling of 738721685 in words is "seven hundred thirty-eight million, seven hundred twenty-one thousand, six hundred eighty-five".