721895452 has 6 divisors (see below), whose sum is σ = 1263317048. Its totient is φ = 360947724.

The previous prime is 721895441. The next prime is 721895459. The reversal of 721895452 is 254598127.

It is a super-2 number, since 2×721895452² = 1042266087236568608, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721895399 and 721895408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721895459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90236928 + ... + 90236935.

Almost surely, 2^721895452 is an apocalyptic number.

It is an amenable number.

721895452 is a deficient number, since it is larger than the sum of its proper divisors (541421596).

721895452 is a wasteful number, since it uses less digits than its factorization.

721895452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180473867 (or 180473865 counting only the distinct ones).

The product of its digits is 201600, while the sum is 43.

The square root of 721895452 is about 26868.1121778215. The cubic root of 721895452 is about 897.0667682494.

The spelling of 721895452 in words is "seven hundred twenty-one million, eight hundred ninety-five thousand, four hundred fifty-two".