30161856 has 56 divisors (see below), whose sum is σ = 82570320. Its totient is φ = 9705472.

The previous prime is 30161851. The next prime is 30161861. The reversal of 30161856 is 65816103.

It is an interprime number because it is at equal distance from previous prime (30161851) and next prime (30161861).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30161851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2860 + ... + 8276.

It is an arithmetic number, because the mean of its divisors is an integer number (1474470).

Almost surely, 2^30161856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30161856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41285160).

30161856 is an abundant number, since it is smaller than the sum of its proper divisors (52408464).

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

30161856 is a wasteful number, since it uses less digits than its factorization.

30161856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461 (or 5451 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 30161856 is about 5491.9810633322. The cubic root of 30161856 is about 311.2810533363.

Adding to 30161856 its reverse (65816103), we get a palindrome (95977959).

The spelling of 30161856 in words is "thirty million, one hundred sixty-one thousand, eight hundred fifty-six".