28901900 has 18 divisors (see below), whose sum is σ = 62717340. Its totient is φ = 11560720.

The previous prime is 28901881. The next prime is 28901911. The reversal of 28901900 is 910982.

It is a super-2 number, since 2×28901900² = 1670639647220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144410 + ... + 144609.

Almost surely, 2^28901900 is an apocalyptic number.

28901900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28901900 is an abundant number, since it is smaller than the sum of its proper divisors (33815440).

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

28901900 is a wasteful number, since it uses less digits than its factorization.

28901900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289033 (or 289026 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 28901900 is about 5376.0487348982. The cubic root of 28901900 is about 306.8848609953.

The spelling of 28901900 in words is "twenty-eight million, nine hundred one thousand, nine hundred".