30216540 has 24 divisors (see below), whose sum is σ = 84606480. Its totient is φ = 8057728.

The previous prime is 30216509. The next prime is 30216547. The reversal of 30216540 is 4561203.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30216547) 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, 251745 + ... + 251864.

It is an arithmetic number, because the mean of its divisors is an integer number (3525270).

Almost surely, 2^30216540 is an apocalyptic number.

30216540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30216540 is an abundant number, since it is smaller than the sum of its proper divisors (54389940).

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

30216540 is a wasteful number, since it uses less digits than its factorization.

30216540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503621 (or 503619 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 30216540 is about 5496.9573402019. The cubic root of 30216540 is about 311.4690591887.

Adding to 30216540 its reverse (4561203), we get a palindrome (34777743).

The spelling of 30216540 in words is "thirty million, two hundred sixteen thousand, five hundred forty".