721505348 has 6 divisors (see below), whose sum is σ = 1262634366. Its totient is φ = 360752672.

The previous prime is 721505333. The next prime is 721505357. The reversal of 721505348 is 843505127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 717811264 + 3694084 = 26792^2 + 1922^2 .

It is a super-2 number, since 2×721505348² = 1041139934385202208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90188165 + ... + 90188172.

It is an arithmetic number, because the mean of its divisors is an integer number (210439061).

Almost surely, 2^721505348 is an apocalyptic number.

It is an amenable number.

721505348 is a deficient number, since it is larger than the sum of its proper divisors (541129018).

721505348 is a wasteful number, since it uses less digits than its factorization.

721505348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180376341 (or 180376339 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 721505348 is about 26860.8515873939. The cubic root of 721505348 is about 896.9051509457.

The spelling of 721505348 in words is "seven hundred twenty-one million, five hundred five thousand, three hundred forty-eight".