28939900 has 36 divisors (see below), whose sum is σ = 68511240. Its totient is φ = 10523200.

The previous prime is 28939877. The next prime is 28939949. The reversal of 28939900 is 993982.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12055 + ... + 14254.

It is an arithmetic number, because the mean of its divisors is an integer number (1903090).

Almost surely, 2^28939900 is an apocalyptic number.

28939900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28939900 is an abundant number, since it is smaller than the sum of its proper divisors (39571340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28939900 is a wasteful number, since it uses less digits than its factorization.

28939900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26334 (or 26327 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 28939900 is about 5379.5817681303. The cubic root of 28939900 is about 307.0192987263.

The spelling of 28939900 in words is "twenty-eight million, nine hundred thirty-nine thousand, nine hundred".