698375721 has 24 divisors (see below), whose sum is σ = 955937920. Its totient is φ = 453428352.

The previous prime is 698375707. The next prime is 698375729. The reversal of 698375721 is 127573896.

It is not a de Polignac number, because 698375721 - 2¹⁹ = 697851433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (698375729) 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 23 ways as a sum of consecutive naturals, for example, 4448175 + ... + 4448331.

Almost surely, 2^698375721 is an apocalyptic number.

It is an amenable number.

698375721 is a deficient number, since it is larger than the sum of its proper divisors (257562199).

698375721 is a wasteful number, since it uses less digits than its factorization.

698375721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 376 counting only the distinct ones).

The product of its digits is 635040, while the sum is 48.

The square root of 698375721 is about 26426.7992954122. The cubic root of 698375721 is about 887.2167061425.

The spelling of 698375721 in words is "six hundred ninety-eight million, three hundred seventy-five thousand, seven hundred twenty-one".