30640236 has 72 divisors (see below), whose sum is σ = 82442304. Its totient is φ = 8782560.

The previous prime is 30640231. The next prime is 30640249. The reversal of 30640236 is 63204603.

It is not an unprimeable number, because it can be changed into a prime (30640231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47331 + ... + 47973.

It is an arithmetic number, because the mean of its divisors is an integer number (1145032).

Almost surely, 2^30640236 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 30640236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41221152).

30640236 is an abundant number, since it is smaller than the sum of its proper divisors (51802068).

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

30640236 is a wasteful number, since it uses less digits than its factorization.

30640236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

The square root of 30640236 is about 5535.3623187647. The cubic root of 30640236 is about 312.9181125459.

Adding to 30640236 its reverse (63204603), we get a palindrome (93844839).

It can be divided in two parts, 30640 and 236, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 30640236 in words is "thirty million, six hundred forty thousand, two hundred thirty-six".