28071090 has 32 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 7485552.

The previous prime is 28071083. The next prime is 28071091. The reversal of 28071090 is 9017082.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (28071091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51714 + ... + 52253.

It is an arithmetic number, because the mean of its divisors is an integer number (2339280).

Almost surely, 2^28071090 is an apocalyptic number.

28071090 is an abundant number, since it is smaller than the sum of its proper divisors (46785870).

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

28071090 is a wasteful number, since it uses less digits than its factorization.

28071090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103983 (or 103977 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 28071090 is about 5298.2157373969. The cubic root of 28071090 is about 303.9156694179.

The spelling of 28071090 in words is "twenty-eight million, seventy-one thousand, ninety".