721078732 has 24 divisors (see below), whose sum is σ = 1457583120. Its totient is φ = 308482560.

The previous prime is 721078717. The next prime is 721078733. The reversal of 721078732 is 237870127.

It is a junction number, because it is equal to n+sod(n) for n = 721078691 and 721078700.

It is not an unprimeable number, because it can be changed into a prime (721078733) 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 in 7 ways as a sum of consecutive naturals, for example, 481257 + ... + 482752.

It is an arithmetic number, because the mean of its divisors is an integer number (60732630).

Almost surely, 2^721078732 is an apocalyptic number.

It is an amenable number.

721078732 is an abundant number, since it is smaller than the sum of its proper divisors (736504388).

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

721078732 is a wasteful number, since it uses less digits than its factorization.

721078732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964041 (or 964039 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 721078732 is about 26852.9091906259. The cubic root of 721078732 is about 896.7283402775.

The spelling of 721078732 in words is "seven hundred twenty-one million, seventy-eight thousand, seven hundred thirty-two".