728421241 has 4 divisors (see below), whose sum is σ = 742165092. Its totient is φ = 714677392.

The previous prime is 728421203. The next prime is 728421269. The reversal of 728421241 is 142124827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 142124827 = 13 ⋅10932679.

It can be written as a sum of positive squares in 2 ways, for example, as 206755641 + 521665600 = 14379^2 + 22840^2 .

It is a cyclic number.

It is not a de Polignac number, because 728421241 - 2¹⁵ = 728388473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728421271) 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, 6871846 + ... + 6871951.

It is an arithmetic number, because the mean of its divisors is an integer number (185541273).

Almost surely, 2^728421241 is an apocalyptic number.

It is an amenable number.

728421241 is a deficient number, since it is larger than the sum of its proper divisors (13743851).

728421241 is a wasteful number, since it uses less digits than its factorization.

728421241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13743850.

The product of its digits is 7168, while the sum is 31.

The square root of 728421241 is about 26989.2801126670. The cubic root of 728421241 is about 899.7617645152.

The spelling of 728421241 in words is "seven hundred twenty-eight million, four hundred twenty-one thousand, two hundred forty-one".