721669352 has 8 divisors (see below), whose sum is σ = 1353130050. Its totient is φ = 360834672.

The previous prime is 721669337. The next prime is 721669357. The reversal of 721669352 is 253966127.

It can be written as a sum of positive squares in only one way, i.e., 713637796 + 8031556 = 26714^2 + 2834^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (721669357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45104327 + ... + 45104342.

Almost surely, 2^721669352 is an apocalyptic number.

It is an amenable number.

721669352 is a deficient number, since it is larger than the sum of its proper divisors (631460698).

721669352 is a wasteful number, since it uses less digits than its factorization.

721669352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90208675 (or 90208671 counting only the distinct ones).

The product of its digits is 136080, while the sum is 41.

The square root of 721669352 is about 26863.9042583166. The cubic root of 721669352 is about 896.9731037284.

It can be divided in two parts, 72166 and 9352, that added together give a palindrome (81518).

The spelling of 721669352 in words is "seven hundred twenty-one million, six hundred sixty-nine thousand, three hundred fifty-two".