28757001 has 16 divisors (see below), whose sum is σ = 47191424. Its totient is φ = 15168384.

The previous prime is 28756993. The next prime is 28757011. The reversal of 28757001 is 10075782.

It is a happy number.

It is not a de Polignac number, because 28757001 - 2³ = 28756993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28757001.

It is not an unprimeable number, because it can be changed into a prime (28757011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52396 + ... + 52941.

It is an arithmetic number, because the mean of its divisors is an integer number (2949464).

Almost surely, 2^28757001 is an apocalyptic number.

28757001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28757001 is a deficient number, since it is larger than the sum of its proper divisors (18434423).

28757001 is a wasteful number, since it uses less digits than its factorization.

28757001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105360.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 28757001 is about 5362.5554542587. Note that the first 3 decimals coincide. The cubic root of 28757001 is about 306.3711481819.

The spelling of 28757001 in words is "twenty-eight million, seven hundred fifty-seven thousand, one".