721402372 has 6 divisors (see below), whose sum is σ = 1262454158. Its totient is φ = 360701184.

The previous prime is 721402369. The next prime is 721402379. The reversal of 721402372 is 273204127.

It can be written as a sum of positive squares in only one way, i.e., 698227776 + 23174596 = 26424^2 + 4814^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 721402372.

It is not an unprimeable number, because it can be changed into a prime (721402379) by changing a digit.

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, 90175293 + ... + 90175300.

Almost surely, 2^721402372 is an apocalyptic number.

It is an amenable number.

721402372 is a deficient number, since it is larger than the sum of its proper divisors (541051786).

721402372 is a wasteful number, since it uses less digits than its factorization.

721402372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180350597 (or 180350595 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 721402372 is about 26858.9346773099. The cubic root of 721402372 is about 896.8624790055.

Adding to 721402372 its reverse (273204127), we get a palindrome (994606499).

The spelling of 721402372 in words is "seven hundred twenty-one million, four hundred two thousand, three hundred seventy-two".