30861440 has 32 divisors (see below), whose sum is σ = 73779660. Its totient is φ = 12344320.

The previous prime is 30861431. The next prime is 30861451. The reversal of 30861440 is 4416803.

It can be written as a sum of positive squares in 2 ways, for example, as 26956864 + 3904576 = 5192^2 + 1976^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23471 + ... + 24750.

Almost surely, 2^30861440 is an apocalyptic number.

It is an amenable number.

30861440 is an abundant number, since it is smaller than the sum of its proper divisors (42918220).

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

30861440 is an equidigital number, since it uses as much as digits as its factorization.

30861440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48240 (or 48228 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 30861440 is about 5555.3073722342. The cubic root of 30861440 is about 313.6693342462.

The spelling of 30861440 in words is "thirty million, eight hundred sixty-one thousand, four hundred forty".