336688721 has 4 divisors (see below), whose sum is σ = 354409200. Its totient is φ = 318968244.

The previous prime is 336688717. The next prime is 336688727. The reversal of 336688721 is 127886633.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127886633 = 7 ⋅18269519.

It is a cyclic number.

It is not a de Polignac number, because 336688721 - 2² = 336688717 is a prime.

It is a super-2 number, since 2×336688721² = 226718589697231682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (336688727) 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, 8860211 + ... + 8860248.

It is an arithmetic number, because the mean of its divisors is an integer number (88602300).

Almost surely, 2^336688721 is an apocalyptic number.

It is an amenable number.

336688721 is a deficient number, since it is larger than the sum of its proper divisors (17720479).

336688721 is a wasteful number, since it uses less digits than its factorization.

336688721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17720478.

The product of its digits is 290304, while the sum is 44.

The square root of 336688721 is about 18349.0795681963. The cubic root of 336688721 is about 695.6800072880.

The spelling of 336688721 in words is "three hundred thirty-six million, six hundred eighty-eight thousand, seven hundred twenty-one".