721642030 has 8 divisors (see below), whose sum is σ = 1298955672. Its totient is φ = 288656808.

The previous prime is 721642007. The next prime is 721642037. The reversal of 721642030 is 30246127.

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 = 721641986 and 721642004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721642037) 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 3 ways as a sum of consecutive naturals, for example, 36082092 + ... + 36082111.

It is an arithmetic number, because the mean of its divisors is an integer number (162369459).

Almost surely, 2^721642030 is an apocalyptic number.

721642030 is a deficient number, since it is larger than the sum of its proper divisors (577313642).

721642030 is a wasteful number, since it uses less digits than its factorization.

721642030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72164210.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 721642030 is about 26863.3957272717. The cubic root of 721642030 is about 896.9617839514.

Adding to 721642030 its reverse (30246127), we get a palindrome (751888157).

The spelling of 721642030 in words is "seven hundred twenty-one million, six hundred forty-two thousand, thirty".