720728434 has 4 divisors (see below), whose sum is σ = 1081092654. Its totient is φ = 360364216.

The previous prime is 720728417. The next prime is 720728453. The reversal of 720728434 is 434827027.

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

It can be written as a sum of positive squares in only one way, i.e., 712623025 + 8105409 = 26695^2 + 2847^2 .

It is a junction number, because it is equal to n+sod(n) for n = 720728393 and 720728402.

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 as a sum of consecutive naturals, namely, 180182107 + ... + 180182110.

Almost surely, 2^720728434 is an apocalyptic number.

720728434 is a deficient number, since it is larger than the sum of its proper divisors (360364220).

720728434 is a wasteful number, since it uses less digits than its factorization.

720728434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360364219.

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 720728434 is about 26846.3858647677. The cubic root of 720728434 is about 896.5831073967.

The spelling of 720728434 in words is "seven hundred twenty million, seven hundred twenty-eight thousand, four hundred thirty-four".