28215802 has 12 divisors (see below), whose sum is σ = 44245530. Its totient is φ = 13494008.

The previous prime is 28215799. The next prime is 28215809. The reversal of 28215802 is 20851282.

It can be written as a sum of positive squares in only one way, i.e., 15832441 + 12383361 = 3979^2 + 3519^2 .

It is a super-2 number, since 2×28215802² = 1592262965006408, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28215809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12277 + ... + 14392.

Almost surely, 2^28215802 is an apocalyptic number.

28215802 is a deficient number, since it is larger than the sum of its proper divisors (16029728).

28215802 is a wasteful number, since it uses less digits than its factorization.

28215802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26717 (or 26694 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 28215802 is about 5311.8548549447. The cubic root of 28215802 is about 304.4370229344.

The spelling of 28215802 in words is "twenty-eight million, two hundred fifteen thousand, eight hundred two".