28261666 has 16 divisors (see below), whose sum is σ = 43622208. Its totient is φ = 13726800.

The previous prime is 28261657. The next prime is 28261693. The reversal of 28261666 is 66616282.

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, 8731 + ... + 11521.

It is an arithmetic number, because the mean of its divisors is an integer number (2726388).

Almost surely, 2^28261666 is an apocalyptic number.

28261666 is a deficient number, since it is larger than the sum of its proper divisors (15360542).

28261666 is a wasteful number, since it uses less digits than its factorization.

28261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937.

The product of its digits is 41472, while the sum is 37.

The square root of 28261666 is about 5316.1702380567. The cubic root of 28261666 is about 304.6018849400.

The spelling of 28261666 in words is "twenty-eight million, two hundred sixty-one thousand, six hundred sixty-six".