28723761 has 32 divisors (see below), whose sum is σ = 49161600. Its totient is φ = 16381440.

The previous prime is 28723753. The next prime is 28723777. The reversal of 28723761 is 16732782.

28723761 is a `hidden beast` number, since 287 + 2 + 376 + 1 = 666.

It is not a de Polignac number, because 28723761 - 2³ = 28723753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28723781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2205 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (1536300).

Almost surely, 2^28723761 is an apocalyptic number.

It is an amenable number.

28723761 is a deficient number, since it is larger than the sum of its proper divisors (20437839).

28723761 is a wasteful number, since it uses less digits than its factorization.

28723761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5726 (or 5720 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 28723761 is about 5359.4552894860. The cubic root of 28723761 is about 306.2530586395.

The spelling of 28723761 in words is "twenty-eight million, seven hundred twenty-three thousand, seven hundred sixty-one".