30725898 has 32 divisors (see below), whose sum is σ = 72499200. Its totient is φ = 8495280.

The previous prime is 30725879. The next prime is 30725899. The reversal of 30725898 is 89852703.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (30725899) 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 15 ways as a sum of consecutive naturals, for example, 10498 + ... + 13101.

It is an arithmetic number, because the mean of its divisors is an integer number (2265600).

Almost surely, 2^30725898 is an apocalyptic number.

30725898 is an abundant number, since it is smaller than the sum of its proper divisors (41773302).

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

30725898 is a wasteful number, since it uses less digits than its factorization.

30725898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23642.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 30725898 is about 5543.0946230423. The cubic root of 30725898 is about 313.2094533177.

The spelling of 30725898 in words is "thirty million, seven hundred twenty-five thousand, eight hundred ninety-eight".