725221020 has 48 divisors (see below), whose sum is σ = 2150070048. Its totient is φ = 182016000.

The previous prime is 725220983. The next prime is 725221033. The reversal of 725221020 is 20122527.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354481 + ... + 356520.

It is an arithmetic number, because the mean of its divisors is an integer number (44793126).

Almost surely, 2^725221020 is an apocalyptic number.

It is an amenable number.

725221020 is an abundant number, since it is smaller than the sum of its proper divisors (1424849028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

725221020 is a wasteful number, since it uses less digits than its factorization.

725221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711030 (or 711028 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 725221020 is about 26929.9279612850. The cubic root of 725221020 is about 898.4421692682.

Adding to 725221020 its reverse (20122527), we get a palindrome (745343547).

The spelling of 725221020 in words is "seven hundred twenty-five million, two hundred twenty-one thousand, twenty".