28701257 has 16 divisors (see below), whose sum is σ = 32148480. Its totient is φ = 25444800.

The previous prime is 28701227. The next prime is 28701269. The reversal of 28701257 is 75210782.

It is a de Polignac number, because none of the positive numbers 2^k-28701257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28701227) 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, 92132 + ... + 92442.

It is an arithmetic number, because the mean of its divisors is an integer number (2009280).

Almost surely, 2^28701257 is an apocalyptic number.

It is an amenable number.

28701257 is a deficient number, since it is larger than the sum of its proper divisors (3447223).

28701257 is a wasteful number, since it uses less digits than its factorization.

28701257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28701257 is about 5357.3554110214. The cubic root of 28701257 is about 306.1730584441.

The spelling of 28701257 in words is "twenty-eight million, seven hundred one thousand, two hundred fifty-seven".