28690867 has 4 divisors (see below), whose sum is σ = 29938320. Its totient is φ = 27443416.

The previous prime is 28690819. The next prime is 28690877. The reversal of 28690867 is 76809682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76809682 = 2 ⋅38404841.

It is not a de Polignac number, because 28690867 - 2²³ = 20302259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28690877) 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, 623692 + ... + 623737.

It is an arithmetic number, because the mean of its divisors is an integer number (7484580).

Almost surely, 2^28690867 is an apocalyptic number.

28690867 is a deficient number, since it is larger than the sum of its proper divisors (1247453).

28690867 is a wasteful number, since it uses less digits than its factorization.

28690867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247452.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 28690867 is about 5356.3856283879. The cubic root of 28690867 is about 306.1361085872.

The spelling of 28690867 in words is "twenty-eight million, six hundred ninety thousand, eight hundred sixty-seven".