28620253 has 4 divisors (see below), whose sum is σ = 28887840. Its totient is φ = 28352668.

The previous prime is 28620247. The next prime is 28620281. The reversal of 28620253 is 35202682.

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 a de Polignac number, because none of the positive numbers 2^k-28620253 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 (28620283) 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, 133633 + ... + 133846.

It is an arithmetic number, because the mean of its divisors is an integer number (7221960).

Almost surely, 2^28620253 is an apocalyptic number.

It is an amenable number.

28620253 is a deficient number, since it is larger than the sum of its proper divisors (267587).

28620253 is a wasteful number, since it uses less digits than its factorization.

28620253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267586.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 28620253 is about 5349.7899958783. The cubic root of 28620253 is about 305.8847480589.

It can be divided in two parts, 2862025 and 3, that added together give a triangular number (2862028 = T₂₃₉₂).

The spelling of 28620253 in words is "twenty-eight million, six hundred twenty thousand, two hundred fifty-three".