220028666 has 32 divisors (see below), whose sum is σ = 390071808. Its totient is φ = 91765440.

The previous prime is 220028659. The next prime is 220028681. The reversal of 220028666 is 666820022.

It is a super-2 number, since 2×220028666² = 96825227723479112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47255 + ... + 51701.

It is an arithmetic number, because the mean of its divisors is an integer number (12189744).

Almost surely, 2^220028666 is an apocalyptic number.

220028666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

220028666 is a deficient number, since it is larger than the sum of its proper divisors (170043142).

220028666 is a wasteful number, since it uses less digits than its factorization.

220028666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4646.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 220028666 is about 14833.3632733780. The cubic root of 220028666 is about 603.7072924223.

Adding to 220028666 its reverse (666820022), we get a palindrome (886848688).

The spelling of 220028666 in words is "two hundred twenty million, twenty-eight thousand, six hundred sixty-six".