28672829 has 4 divisors (see below), whose sum is σ = 30359484. Its totient is φ = 26986176.

The previous prime is 28672823. The next prime is 28672849. The reversal of 28672829 is 92827682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92827682 = 2 ⋅46413841.

It can be written as a sum of positive squares in 2 ways, for example, as 15784729 + 12888100 = 3973^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 28672829 - 2⁸ = 28672573 is a prime.

It is a super-2 number, since 2×28672829² = 1644262245726482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28672829.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28672823) 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, 843302 + ... + 843335.

It is an arithmetic number, because the mean of its divisors is an integer number (7589871).

Almost surely, 2^28672829 is an apocalyptic number.

It is an amenable number.

28672829 is a deficient number, since it is larger than the sum of its proper divisors (1686655).

28672829 is a wasteful number, since it uses less digits than its factorization.

28672829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686654.

The product of its digits is 193536, while the sum is 44.

The square root of 28672829 is about 5354.7015789865. The cubic root of 28672829 is about 306.0719390290.

The spelling of 28672829 in words is "twenty-eight million, six hundred seventy-two thousand, eight hundred twenty-nine".