725522018 has 8 divisors (see below), whose sum is σ = 1171997148. Its totient is φ = 334856304.

The previous prime is 725522003. The next prime is 725522027. The reversal of 725522018 is 810225527.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 675636049 + 49885969 = 25993^2 + 7063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13952321 + ... + 13952372.

Almost surely, 2^725522018 is an apocalyptic number.

725522018 is a deficient number, since it is larger than the sum of its proper divisors (446475130).

725522018 is a wasteful number, since it uses less digits than its factorization.

725522018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27904708.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 725522018 is about 26935.5159222911. The cubic root of 725522018 is about 898.5664494918.

The spelling of 725522018 in words is "seven hundred twenty-five million, five hundred twenty-two thousand, eighteen".