28901812 has 12 divisors (see below), whose sum is σ = 53240320. Its totient is φ = 13690296.

The previous prime is 28901809. The next prime is 28901833. The reversal of 28901812 is 21810982.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190068 + ... + 190219.

Almost surely, 2^28901812 is an apocalyptic number.

It is an amenable number.

28901812 is a deficient number, since it is larger than the sum of its proper divisors (24338508).

28901812 is a wasteful number, since it uses less digits than its factorization.

28901812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380310 (or 380308 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 28901812 is about 5376.0405504423. The cubic root of 28901812 is about 306.8845495291.

The spelling of 28901812 in words is "twenty-eight million, nine hundred one thousand, eight hundred twelve".