28761601 has 4 divisors (see below), whose sum is σ = 31376304. Its totient is φ = 26146900.

The previous prime is 28761599. The next prime is 28761631. The reversal of 28761601 is 10616782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28761601 - 2¹ = 28761599 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28761631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307335 + ... + 1307356.

It is an arithmetic number, because the mean of its divisors is an integer number (7844076).

Almost surely, 2^28761601 is an apocalyptic number.

It is an amenable number.

28761601 is a deficient number, since it is larger than the sum of its proper divisors (2614703).

28761601 is a wasteful number, since it uses less digits than its factorization.

28761601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614702.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28761601 is about 5362.9843371019. The cubic root of 28761601 is about 306.3874831275.

The spelling of 28761601 in words is "twenty-eight million, seven hundred sixty-one thousand, six hundred one".