721317270 has 32 divisors (see below), whose sum is σ = 1733177088. Its totient is φ = 192127328.

The previous prime is 721317239. The next prime is 721317323. The reversal of 721317270 is 72713127.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13057 + ... + 40163.

It is an arithmetic number, because the mean of its divisors is an integer number (54161784).

Almost surely, 2^721317270 is an apocalyptic number.

721317270 is an abundant number, since it is smaller than the sum of its proper divisors (1011859818).

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

721317270 is a wasteful number, since it uses less digits than its factorization.

721317270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28004.

The product of its (nonzero) digits is 4116, while the sum is 30.

The square root of 721317270 is about 26857.3503905355. The cubic root of 721317270 is about 896.8272107580.

It can be divided in two parts, 72131 and 7270, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 721317270 in words is "seven hundred twenty-one million, three hundred seventeen thousand, two hundred seventy".