28723767 has 4 divisors (see below), whose sum is σ = 38298360. Its totient is φ = 19149176.

The previous prime is 28723753. The next prime is 28723777. The reversal of 28723767 is 76732782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28723767 - 2⁶ = 28723703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28723777) 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, 4787292 + ... + 4787297.

It is an arithmetic number, because the mean of its divisors is an integer number (9574590).

Almost surely, 2^28723767 is an apocalyptic number.

28723767 is a deficient number, since it is larger than the sum of its proper divisors (9574593).

28723767 is an equidigital number, since it uses as much as digits as its factorization.

28723767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9574592.

The product of its digits is 197568, while the sum is 42.

The square root of 28723767 is about 5359.4558492444. The cubic root of 28723767 is about 306.2530799635.

The spelling of 28723767 in words is "twenty-eight million, seven hundred twenty-three thousand, seven hundred sixty-seven".