721479687 has 16 divisors (see below), whose sum is σ = 988753920. Its totient is φ = 467616672.

The previous prime is 721479641. The next prime is 721479743. The reversal of 721479687 is 786974127.

It is not a de Polignac number, because 721479687 - 2⁶ = 721479623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721479287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247078 + ... + 249980.

It is an arithmetic number, because the mean of its divisors is an integer number (61797120).

Almost surely, 2^721479687 is an apocalyptic number.

721479687 is a deficient number, since it is larger than the sum of its proper divisors (267274233).

721479687 is a wasteful number, since it uses less digits than its factorization.

721479687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5182.

The product of its digits is 1185408, while the sum is 51.

The square root of 721479687 is about 26860.3739177250. The cubic root of 721479687 is about 896.8945177346.

The spelling of 721479687 in words is "seven hundred twenty-one million, four hundred seventy-nine thousand, six hundred eighty-seven".