28109475 has 36 divisors (see below), whose sum is σ = 50642592. Its totient is φ = 14904000.

The previous prime is 28109461. The next prime is 28109489. The reversal of 28109475 is 57490182.

It is an interprime number because it is at equal distance from previous prime (28109461) and next prime (28109489).

It is not a de Polignac number, because 28109475 - 2²¹ = 26012323 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60745 + ... + 61205.

Almost surely, 2^28109475 is an apocalyptic number.

28109475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28109475 is a deficient number, since it is larger than the sum of its proper divisors (22533117).

28109475 is a wasteful number, since it uses less digits than its factorization.

28109475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28109475 is about 5301.8369458142. The cubic root of 28109475 is about 304.0541332212.

The spelling of 28109475 in words is "twenty-eight million, one hundred nine thousand, four hundred seventy-five".