10728421 has 8 divisors (see below), whose sum is σ = 11757600. Its totient is φ = 9708240.

The previous prime is 10728401. The next prime is 10728427. The reversal of 10728421 is 12482701.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10728421 - 2¹⁹ = 10204133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10728427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390 + ... + 4648.

It is an arithmetic number, because the mean of its divisors is an integer number (1469700).

Almost surely, 2^10728421 is an apocalyptic number.

10728421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10728421 is a deficient number, since it is larger than the sum of its proper divisors (1029179).

10728421 is a wasteful number, since it uses less digits than its factorization.

10728421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 10728421 is about 3275.4268424131. The cubic root of 10728421 is about 220.5524750718.

The spelling of 10728421 in words is "ten million, seven hundred twenty-eight thousand, four hundred twenty-one".