725403420 has 72 divisors (see below), whose sum is σ = 2514736224. Its totient is φ = 165806208.

The previous prime is 725403391. The next prime is 725403433. The reversal of 725403420 is 24304527.

725403420 is a `hidden beast` number, since 72 + 540 + 34 + 20 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286599 + ... + 289118.

It is an arithmetic number, because the mean of its divisors is an integer number (34926892).

Almost surely, 2^725403420 is an apocalyptic number.

725403420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

725403420 is an abundant number, since it is smaller than the sum of its proper divisors (1789332804).

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

725403420 is a wasteful number, since it uses less digits than its factorization.

725403420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575739 (or 575734 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 27.

The square root of 725403420 is about 26933.3143151748. The cubic root of 725403420 is about 898.5174852111.

Adding to 725403420 its reverse (24304527), we get a palindrome (749707947).

The spelling of 725403420 in words is "seven hundred twenty-five million, four hundred three thousand, four hundred twenty".