721522052 has 48 divisors (see below), whose sum is σ = 1364643840. Its totient is φ = 332906112.

The previous prime is 721522037. The next prime is 721522097. The reversal of 721522052 is 250225127.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 431474 + ... + 433142.

It is an arithmetic number, because the mean of its divisors is an integer number (28430080).

Almost surely, 2^721522052 is an apocalyptic number.

It is an amenable number.

721522052 is a deficient number, since it is larger than the sum of its proper divisors (643121788).

721522052 is a wasteful number, since it uses less digits than its factorization.

721522052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860 (or 1858 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 721522052 is about 26861.1625213802. The cubic root of 721522052 is about 896.9120724873.

Adding to 721522052 its reverse (250225127), we get a palindrome (971747179).

The spelling of 721522052 in words is "seven hundred twenty-one million, five hundred twenty-two thousand, fifty-two".