28820308 has 24 divisors (see below), whose sum is σ = 55246464. Its totient is φ = 13046400.

The previous prime is 28820291. The next prime is 28820347. The reversal of 28820308 is 80302882.

It is a super-2 number, since 2×28820308² = 1661220306429728, 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 28820308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10716 + ... + 13132.

It is an arithmetic number, because the mean of its divisors is an integer number (2301936).

Almost surely, 2^28820308 is an apocalyptic number.

It is an amenable number.

28820308 is a deficient number, since it is larger than the sum of its proper divisors (26426156).

28820308 is a wasteful number, since it uses less digits than its factorization.

28820308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2703 (or 2701 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 28820308 is about 5368.4548987581. The cubic root of 28820308 is about 306.5958033072.

The spelling of 28820308 in words is "twenty-eight million, eight hundred twenty thousand, three hundred eight".