30781325 has 12 divisors (see below), whose sum is σ = 39485940. Its totient is φ = 23775360.

The previous prime is 30781321. The next prime is 30781343. The reversal of 30781325 is 52318703.

It can be written as a sum of positive squares in 6 ways, for example, as 454276 + 30327049 = 674^2 + 5507^2 .

It is not a de Polignac number, because 30781325 - 2² = 30781321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30781321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20504 + ... + 21953.

It is an arithmetic number, because the mean of its divisors is an integer number (3290495).

Almost surely, 2^30781325 is an apocalyptic number.

It is an amenable number.

30781325 is a deficient number, since it is larger than the sum of its proper divisors (8704615).

30781325 is a wasteful number, since it uses less digits than its factorization.

30781325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42496 (or 42491 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 30781325 is about 5548.0920143776. The cubic root of 30781325 is about 313.3976749062.

The spelling of 30781325 in words is "thirty million, seven hundred eighty-one thousand, three hundred twenty-five".