28712501 has 2 divisors, whose sum is σ = 28712502. Its totient is φ = 28712500.

The previous prime is 28712459. The next prime is 28712503. The reversal of 28712501 is 10521782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 303601 = 5330^2 + 551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28712501 is a prime.

Together with 28712503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28712503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14356250 + 14356251.

It is an arithmetic number, because the mean of its divisors is an integer number (14356251).

Almost surely, 2^28712501 is an apocalyptic number.

It is an amenable number.

28712501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28712501 is an equidigital number, since it uses as much as digits as its factorization.

28712501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 28712501 is about 5358.4047066268. The cubic root of 28712501 is about 306.2130353275.

The spelling of 28712501 in words is "twenty-eight million, seven hundred twelve thousand, five hundred one".