10278721 has 4 divisors (see below), whose sum is σ = 10346944. Its totient is φ = 10210500.

The previous prime is 10278703. The next prime is 10278743. The reversal of 10278721 is 12787201.

10278721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 12787201 = 7 ⋅1826743.

It is a cyclic number.

It is not a de Polignac number, because 10278721 - 2⁵ = 10278689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10278721.

It is not an unprimeable number, because it can be changed into a prime (10278781) 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, 33885 + ... + 34186.

It is an arithmetic number, because the mean of its divisors is an integer number (2586736).

Almost surely, 2^10278721 is an apocalyptic number.

It is an amenable number.

10278721 is a deficient number, since it is larger than the sum of its proper divisors (68223).

10278721 is an equidigital number, since it uses as much as digits as its factorization.

10278721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68222.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 10278721 is about 3206.0444476021. The cubic root of 10278721 is about 217.4267758970.

The spelling of 10278721 in words is "ten million, two hundred seventy-eight thousand, seven hundred twenty-one".