721610132 has 12 divisors (see below), whose sum is σ = 1306363380. Its totient is φ = 348363456.

The previous prime is 721610093. The next prime is 721610143. The reversal of 721610132 is 231016127.

It can be written as a sum of positive squares in 2 ways, for example, as 260047876 + 461562256 = 16126^2 + 21484^2 .

It is a junction number, because it is equal to n+sod(n) for n = 721610098 and 721610107.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3110273 + ... + 3110504.

It is an arithmetic number, because the mean of its divisors is an integer number (108863615).

Almost surely, 2^721610132 is an apocalyptic number.

It is an amenable number.

721610132 is a deficient number, since it is larger than the sum of its proper divisors (584753248).

721610132 is a wasteful number, since it uses less digits than its factorization.

721610132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220810 (or 6220808 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 721610132 is about 26862.8020131929. The cubic root of 721610132 is about 896.9485679304.

Adding to 721610132 its reverse (231016127), we get a palindrome (952626259).

The spelling of 721610132 in words is "seven hundred twenty-one million, six hundred ten thousand, one hundred thirty-two".