202428709 has 4 divisors (see below), whose sum is σ = 231347104. Its totient is φ = 173510316.

The previous prime is 202428703. The next prime is 202428713. The reversal of 202428709 is 907824202.

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, and also an emirpimes, since its reverse is a distinct semiprime: 907824202 = 2 ⋅453912101.

It is not a de Polignac number, because 202428709 - 2⁷ = 202428581 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 (202428703) 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, 14459187 + ... + 14459200.

It is an arithmetic number, because the mean of its divisors is an integer number (57836776).

Almost surely, 2^202428709 is an apocalyptic number.

It is an amenable number.

202428709 is a deficient number, since it is larger than the sum of its proper divisors (28918395).

202428709 is an equidigital number, since it uses as much as digits as its factorization.

202428709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28918394.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 202428709 is about 14227.7443398453. The cubic root of 202428709 is about 587.1612257833.

The spelling of 202428709 in words is "two hundred two million, four hundred twenty-eight thousand, seven hundred nine".