721335273 has 8 divisors (see below), whose sum is σ = 982243968. Its totient is φ = 470658384.

The previous prime is 721335259. The next prime is 721335287. The reversal of 721335273 is 372533127.

It is an interprime number because it is at equal distance from previous prime (721335259) and next prime (721335287).

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

It is not a de Polignac number, because 721335273 - 2¹⁶ = 721269737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721335773) 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, 2557786 + ... + 2558067.

It is an arithmetic number, because the mean of its divisors is an integer number (122780496).

Almost surely, 2^721335273 is an apocalyptic number.

It is an amenable number.

721335273 is a deficient number, since it is larger than the sum of its proper divisors (260908695).

721335273 is a wasteful number, since it uses less digits than its factorization.

721335273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5115903.

The product of its digits is 26460, while the sum is 33.

The square root of 721335273 is about 26857.6855480885. The cubic root of 721335273 is about 896.8346718511.

It can be divided in two parts, 7213 and 35273, that added together give a triangular number (42486 = T₂₉₁).

The spelling of 721335273 in words is "seven hundred twenty-one million, three hundred thirty-five thousand, two hundred seventy-three".