253720730 has 8 divisors (see below), whose sum is σ = 456697332. Its totient is φ = 101488288.

The previous prime is 253720693. The next prime is 253720763. The reversal of 253720730 is 37027352.

It can be written as a sum of positive squares in 2 ways, for example, as 226231681 + 27489049 = 15041^2 + 5243^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 253720693 and 253720702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12686027 + ... + 12686046.

Almost surely, 2^253720730 is an apocalyptic number.

253720730 is a deficient number, since it is larger than the sum of its proper divisors (202976602).

253720730 is a wasteful number, since it uses less digits than its factorization.

253720730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25372080.

The product of its (nonzero) digits is 8820, while the sum is 29.

The square root of 253720730 is about 15928.6135617636. The cubic root of 253720730 is about 633.0703651271.

The spelling of 253720730 in words is "two hundred fifty-three million, seven hundred twenty thousand, seven hundred thirty".