28207890 has 48 divisors (see below), whose sum is σ = 76534848. Its totient is φ = 7194528.

The previous prime is 28207853. The next prime is 28207901. The reversal of 28207890 is 9870282.

It is a super-3 number, since 3×28207890³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 4744 + ... + 8883.

It is an arithmetic number, because the mean of its divisors is an integer number (1594476).

Almost surely, 2^28207890 is an apocalyptic number.

28207890 is an abundant number, since it is smaller than the sum of its proper divisors (48326958).

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

28207890 is a wasteful number, since it uses less digits than its factorization.

28207890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13663 (or 13660 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28207890 is about 5311.1100534634. The cubic root of 28207890 is about 304.4085645207.

The spelling of 28207890 in words is "twenty-eight million, two hundred seven thousand, eight hundred ninety".