721424632 has 8 divisors (see below), whose sum is σ = 1352671200. Its totient is φ = 360712312.

The previous prime is 721424621. The next prime is 721424633. The reversal of 721424632 is 236424127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 721424594 and 721424603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721424633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45089032 + ... + 45089047.

It is an arithmetic number, because the mean of its divisors is an integer number (169083900).

Almost surely, 2^721424632 is an apocalyptic number.

It is an amenable number.

721424632 is a deficient number, since it is larger than the sum of its proper divisors (631246568).

721424632 is a wasteful number, since it uses less digits than its factorization.

721424632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90178085 (or 90178081 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 721424632 is about 26859.3490613604. The cubic root of 721424632 is about 896.8717036094.

Adding to 721424632 its reverse (236424127), we get a palindrome (957848759).

The spelling of 721424632 in words is "seven hundred twenty-one million, four hundred twenty-four thousand, six hundred thirty-two".