28901065 has 8 divisors (see below), whose sum is σ = 35156808. Its totient is φ = 22803840.

The previous prime is 28901063. The next prime is 28901069. The reversal of 28901065 is 56010982.

It can be written as a sum of positive squares in 4 ways, for example, as 3337929 + 25563136 = 1827^2 + 5056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28901065 - 2¹ = 28901063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28901063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39226 + ... + 39955.

It is an arithmetic number, because the mean of its divisors is an integer number (4394601).

Almost surely, 2^28901065 is an apocalyptic number.

It is an amenable number.

28901065 is a deficient number, since it is larger than the sum of its proper divisors (6255743).

28901065 is an equidigital number, since it uses as much as digits as its factorization.

28901065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79259.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 28901065 is about 5375.9710750710. The cubic root of 28901065 is about 306.8819055803.

The spelling of 28901065 in words is "twenty-eight million, nine hundred one thousand, sixty-five".