30525440 has 96 divisors (see below), whose sum is σ = 80196480. Its totient is φ = 11059200.

The previous prime is 30525433. The next prime is 30525463. The reversal of 30525440 is 4452503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112505 + ... + 112775.

It is an arithmetic number, because the mean of its divisors is an integer number (835380).

Almost surely, 2^30525440 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 30525440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40098240).

30525440 is an abundant number, since it is smaller than the sum of its proper divisors (49671040).

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

30525440 is a wasteful number, since it uses less digits than its factorization.

30525440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 289 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 30525440 is about 5524.9832578932. The cubic root of 30525440 is about 312.5268328959.

Adding to 30525440 its reverse (4452503), we get a palindrome (34977943).

The spelling of 30525440 in words is "thirty million, five hundred twenty-five thousand, four hundred forty".