28717090 has 16 divisors (see below), whose sum is σ = 51751872. Its totient is φ = 11473264.

The previous prime is 28717081. The next prime is 28717103. The reversal of 28717090 is 9071782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15177 + ... + 16963.

It is an arithmetic number, because the mean of its divisors is an integer number (3234492).

Almost surely, 2^28717090 is an apocalyptic number.

28717090 is a deficient number, since it is larger than the sum of its proper divisors (23034782).

28717090 is a wasteful number, since it uses less digits than its factorization.

28717090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 28717090 is about 5358.8328953234. The cubic root of 28717090 is about 306.2293480451.

It can be divided in two parts, 2871 and 7090, that multiplied together give a triangular number (20355390 = T₆₃₈₀).

The spelling of 28717090 in words is "twenty-eight million, seven hundred seventeen thousand, ninety".