721725036 has 24 divisors (see below), whose sum is σ = 1695181824. Its totient is φ = 238981200.

The previous prime is 721725031. The next prime is 721725047. The reversal of 721725036 is 630527127.

721725036 = T₃₀₁₆ + T₃₀₁₇ + ... + T₃₁₆₆.

It is a junction number, because it is equal to n+sod(n) for n = 721724988 and 721725006.

It is not an unprimeable number, because it can be changed into a prime (721725031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197340 + ... + 200963.

It is an arithmetic number, because the mean of its divisors is an integer number (70632576).

Almost surely, 2^721725036 is an apocalyptic number.

It is an amenable number.

721725036 is an abundant number, since it is smaller than the sum of its proper divisors (973456788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721725036 is a wasteful number, since it uses less digits than its factorization.

721725036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398461 (or 398459 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The square root of 721725036 is about 26864.9406476173. The cubic root of 721725036 is about 896.9961732803.

The spelling of 721725036 in words is "seven hundred twenty-one million, seven hundred twenty-five thousand, thirty-six".