28745757 has 24 divisors (see below), whose sum is σ = 43226040. Its totient is φ = 18385920.

The previous prime is 28745753. The next prime is 28745767. The reversal of 28745757 is 75754782.

28745757 is a `hidden beast` number, since 2 + 8 + 74 + 575 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13111641 + 15634116 = 3621^2 + 3954^2 .

It is not a de Polignac number, because 28745757 - 2² = 28745753 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745753) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62673 + ... + 63129.

It is an arithmetic number, because the mean of its divisors is an integer number (1801085).

Almost surely, 2^28745757 is an apocalyptic number.

It is an amenable number.

28745757 is a deficient number, since it is larger than the sum of its proper divisors (14480283).

28745757 is a wasteful number, since it uses less digits than its factorization.

28745757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 733 (or 730 counting only the distinct ones).

The product of its digits is 548800, while the sum is 45.

The square root of 28745757 is about 5361.5069709924. The cubic root of 28745757 is about 306.3312125587.

The spelling of 28745757 in words is "twenty-eight million, seven hundred forty-five thousand, seven hundred fifty-seven".