721601279 has 8 divisors (see below), whose sum is σ = 827504160. Its totient is φ = 616402656.

The previous prime is 721601249. The next prime is 721601297. The reversal of 721601279 is 972106127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721601279 - 2¹² = 721597183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721601249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173864 + ... + 177965.

It is an arithmetic number, because the mean of its divisors is an integer number (103438020).

Almost surely, 2^721601279 is an apocalyptic number.

721601279 is a deficient number, since it is larger than the sum of its proper divisors (105902881).

721601279 is a wasteful number, since it uses less digits than its factorization.

721601279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352129.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 721601279 is about 26862.6372309198. The cubic root of 721601279 is about 896.9448998749.

The spelling of 721601279 in words is "seven hundred twenty-one million, six hundred one thousand, two hundred seventy-nine".