28772053 has 4 divisors (see below), whose sum is σ = 29243788. Its totient is φ = 28300320.

The previous prime is 28771997. The next prime is 28772063. The reversal of 28772053 is 35027782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13972644 + 14799409 = 3738^2 + 3847^2 .

It is a cyclic number.

It is not a de Polignac number, because 28772053 - 2⁹ = 28771541 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 (28772063) 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, 235776 + ... + 235897.

It is an arithmetic number, because the mean of its divisors is an integer number (7310947).

Almost surely, 2^28772053 is an apocalyptic number.

It is an amenable number.

28772053 is a deficient number, since it is larger than the sum of its proper divisors (471735).

28772053 is an equidigital number, since it uses as much as digits as its factorization.

28772053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471734.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28772053 is about 5363.9587060305. The cubic root of 28772053 is about 306.4245924912.

The spelling of 28772053 in words is "twenty-eight million, seven hundred seventy-two thousand, fifty-three".