28919650 has 24 divisors (see below), whose sum is σ = 55045584. Its totient is φ = 11298000.

The previous prime is 28919647. The next prime is 28919659. The reversal of 28919650 is 5691982.

It is a super-2 number, since 2×28919650² = 1672692312245000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28919659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4576 + ... + 8875.

It is an arithmetic number, because the mean of its divisors is an integer number (2293566).

Almost surely, 2^28919650 is an apocalyptic number.

28919650 is a deficient number, since it is larger than the sum of its proper divisors (26125934).

28919650 is a wasteful number, since it uses less digits than its factorization.

28919650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13506 (or 13501 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 28919650 is about 5377.6993222009. The cubic root of 28919650 is about 306.9476722238.

The spelling of 28919650 in words is "twenty-eight million, nine hundred nineteen thousand, six hundred fifty".