30724225 has 24 divisors (see below), whose sum is σ = 44441600. Its totient is φ = 21062160.

The previous prime is 30724201. The next prime is 30724237. The reversal of 30724225 is 52242703.

It is not a de Polignac number, because 30724225 - 2¹⁷ = 30593153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 30724225.

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, 6784 + ... + 10366.

Almost surely, 2^30724225 is an apocalyptic number.

30724225 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

30724225 is a deficient number, since it is larger than the sum of its proper divisors (13717375).

30724225 is an equidigital number, since it uses as much as digits as its factorization.

30724225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3614 (or 3595 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 30724225 is about 5542.9437125051. The cubic root of 30724225 is about 313.2037685483.

Adding to 30724225 its reverse (52242703), we get a palindrome (82966928).

The spelling of 30724225 in words is "thirty million, seven hundred twenty-four thousand, two hundred twenty-five".