30861312 has 48 divisors (see below), whose sum is σ = 82293120. Its totient is φ = 10285056.

The previous prime is 30861289. The next prime is 30861323. The reversal of 30861312 is 21316803.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×30861312² = 1904841156722688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3633 + ... + 8655.

It is an arithmetic number, because the mean of its divisors is an integer number (1714440).

Almost surely, 2^30861312 is an apocalyptic number.

30861312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30861312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41146560).

30861312 is an abundant number, since it is smaller than the sum of its proper divisors (51431808).

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

30861312 is an equidigital number, since it uses as much as digits as its factorization.

30861312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048 (or 5028 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 30861312 is about 5555.2958517076. The cubic root of 30861312 is about 313.6689005904.

The spelling of 30861312 in words is "thirty million, eight hundred sixty-one thousand, three hundred twelve".