721429768 has 32 divisors (see below), whose sum is σ = 1430392320. Its totient is φ = 340560000.

The previous prime is 721429759. The next prime is 721429771. The reversal of 721429768 is 867924127.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25308 + ... + 45643.

It is an arithmetic number, because the mean of its divisors is an integer number (44699760).

Almost surely, 2^721429768 is an apocalyptic number.

It is an amenable number.

721429768 is a deficient number, since it is larger than the sum of its proper divisors (708962552).

721429768 is a wasteful number, since it uses less digits than its factorization.

721429768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71029 (or 71025 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 721429768 is about 26859.4446703576. Note that the first 3 decimals coincide. The cubic root of 721429768 is about 896.8738319547.

The spelling of 721429768 in words is "seven hundred twenty-one million, four hundred twenty-nine thousand, seven hundred sixty-eight".