721315270 has 64 divisors (see below), whose sum is σ = 1501670016. Its totient is φ = 247080960.

The previous prime is 721315237. The next prime is 721315279. The reversal of 721315270 is 72513127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721315279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154612 + ... + 159208.

It is an arithmetic number, because the mean of its divisors is an integer number (23463594).

Almost surely, 2^721315270 is an apocalyptic number.

721315270 is an abundant number, since it is smaller than the sum of its proper divisors (780354746).

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

721315270 is a wasteful number, since it uses less digits than its factorization.

721315270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 721315270 is about 26857.3131567549. The cubic root of 721315270 is about 896.8263818781.

Adding to 721315270 its reverse (72513127), we get a palindrome (793828397).

The spelling of 721315270 in words is "seven hundred twenty-one million, three hundred fifteen thousand, two hundred seventy".