721408936 has 64 divisors (see below), whose sum is σ = 1453478400. Its totient is φ = 335059200.

The previous prime is 721408927. The next prime is 721408937. The reversal of 721408936 is 639804127.

It is not an unprimeable number, because it can be changed into a prime (721408937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649950 + ... + 651058.

It is an arithmetic number, because the mean of its divisors is an integer number (22710600).

Almost surely, 2^721408936 is an apocalyptic number.

It is an amenable number.

721408936 is an abundant number, since it is smaller than the sum of its proper divisors (732069464).

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

721408936 is a wasteful number, since it uses less digits than its factorization.

721408936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250 (or 1246 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 721408936 is about 26859.0568710072. The cubic root of 721408936 is about 896.8651991645.

The spelling of 721408936 in words is "seven hundred twenty-one million, four hundred eight thousand, nine hundred thirty-six".