28623786 has 8 divisors (see below), whose sum is σ = 57247584. Its totient is φ = 9541260.

The previous prime is 28623779. The next prime is 28623809. The reversal of 28623786 is 68732682.

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

28623786 is an admirable number.

It is a super-2 number, since 2×28623786² = 1638642249947592, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2385310 + ... + 2385321.

It is an arithmetic number, because the mean of its divisors is an integer number (7155948).

Almost surely, 2^28623786 is an apocalyptic number.

28623786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28623786 is a wasteful number, since it uses less digits than its factorization.

28623786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770636.

The product of its digits is 193536, while the sum is 42.

The square root of 28623786 is about 5350.1201855659. The cubic root of 28623786 is about 305.8973340919.

The spelling of 28623786 in words is "twenty-eight million, six hundred twenty-three thousand, seven hundred eighty-six".