28770901 has 4 divisors (see below), whose sum is σ = 28783404. Its totient is φ = 28758400.

The previous prime is 28770899. The next prime is 28770943. The reversal of 28770901 is 10907782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 10907782 = 2 ⋅5453891.

It can be written as a sum of positive squares in 2 ways, for example, as 25704900 + 3066001 = 5070^2 + 1751^2 .

It is a cyclic number.

It is not a de Polignac number, because 28770901 - 2¹ = 28770899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1690 + ... + 7771.

It is an arithmetic number, because the mean of its divisors is an integer number (7195851).

Almost surely, 2^28770901 is an apocalyptic number.

It is an amenable number.

28770901 is a deficient number, since it is larger than the sum of its proper divisors (12503).

28770901 is an equidigital number, since it uses as much as digits as its factorization.

28770901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12502.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 28770901 is about 5363.8513215786. The cubic root of 28770901 is about 306.4205028069.

The spelling of 28770901 in words is "twenty-eight million, seven hundred seventy thousand, nine hundred one".