28505914 has 4 divisors (see below), whose sum is σ = 42758874. Its totient is φ = 14252956.

The previous prime is 28505903. The next prime is 28505933. The reversal of 28505914 is 41950582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41950582 = 2 ⋅20975291.

It can be written as a sum of positive squares in only one way, i.e., 28440889 + 65025 = 5333^2 + 255^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28505914.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7126477 + ... + 7126480.

Almost surely, 2^28505914 is an apocalyptic number.

28505914 is a deficient number, since it is larger than the sum of its proper divisors (14252960).

28505914 is a wasteful number, since it uses less digits than its factorization.

28505914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14252959.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 28505914 is about 5339.0929941330. The cubic root of 28505914 is about 305.4768640015.

The spelling of 28505914 in words is "twenty-eight million, five hundred five thousand, nine hundred fourteen".