28188670 has 8 divisors (see below), whose sum is σ = 50739624. Its totient is φ = 11275464.

The previous prime is 28188661. The next prime is 28188679. The reversal of 28188670 is 7688182.

It is an interprime number because it is at equal distance from previous prime (28188661) and next prime (28188679).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×28188670² = 1589202232737800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409424 + ... + 1409443.

It is an arithmetic number, because the mean of its divisors is an integer number (6342453).

Almost surely, 2^28188670 is an apocalyptic number.

28188670 is a deficient number, since it is larger than the sum of its proper divisors (22550954).

28188670 is a wasteful number, since it uses less digits than its factorization.

28188670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818874.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28188670 is about 5309.3003305520. The cubic root of 28188670 is about 304.3394105600.

The spelling of 28188670 in words is "twenty-eight million, one hundred eighty-eight thousand, six hundred seventy".