28021246 has 8 divisors (see below), whose sum is σ = 45852984. Its totient is φ = 12736920.

The previous prime is 28021237. The next prime is 28021249. The reversal of 28021246 is 64212082.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28021246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28021249) 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, 636825 + ... + 636868.

It is an arithmetic number, because the mean of its divisors is an integer number (5731623).

Almost surely, 2^28021246 is an apocalyptic number.

28021246 is the 2830-th centered heptagonal number.

28021246 is a deficient number, since it is larger than the sum of its proper divisors (17831738).

28021246 is a wasteful number, since it uses less digits than its factorization.

28021246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273706.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28021246 is about 5293.5097997453. The cubic root of 28021246 is about 303.7356817809.

The spelling of 28021246 in words is "twenty-eight million, twenty-one thousand, two hundred forty-six".