30725540 has 24 divisors (see below), whose sum is σ = 66269112. Its totient is φ = 11957760.

The previous prime is 30725509. The next prime is 30725543. The reversal of 30725540 is 4552703.

It can be written as a sum of positive squares in 4 ways, for example, as 14258176 + 16467364 = 3776^2 + 4058^2 .

It is not an unprimeable number, because it can be changed into a prime (30725543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20021 + ... + 21500.

It is an arithmetic number, because the mean of its divisors is an integer number (2761213).

Almost surely, 2^30725540 is an apocalyptic number.

It is an amenable number.

30725540 is an abundant number, since it is smaller than the sum of its proper divisors (35543572).

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

30725540 is a wasteful number, since it uses less digits than its factorization.

30725540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41567 (or 41565 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 30725540 is about 5543.0623305173. The cubic root of 30725540 is about 313.2082368691.

The spelling of 30725540 in words is "thirty million, seven hundred twenty-five thousand, five hundred forty".