728421237 has 12 divisors (see below), whose sum is σ = 1052762464. Its totient is φ = 485337960.

The previous prime is 728421203. The next prime is 728421269. The reversal of 728421237 is 732124827.

It is not a de Polignac number, because 728421237 - 2¹⁰ = 728420213 is a prime.

It is a super-2 number, since 2×728421237² = 1061194997025220338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728421277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5623 + ... + 38580.

Almost surely, 2^728421237 is an apocalyptic number.

It is an amenable number.

728421237 is a deficient number, since it is larger than the sum of its proper divisors (324341227).

728421237 is a wasteful number, since it uses less digits than its factorization.

728421237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46040 (or 46037 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 728421237 is about 26989.2800385635. The cubic root of 728421237 is about 899.7617628682.

The spelling of 728421237 in words is "seven hundred twenty-eight million, four hundred twenty-one thousand, two hundred thirty-seven".