30312240 has 80 divisors (see below), whose sum is σ = 107397888. Its totient is φ = 6928128.

The previous prime is 30312211. The next prime is 30312263. The reversal of 30312240 is 4221303.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-4 number, since 4×30312240⁴ (a number of 31 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7342 + ... + 10701.

Almost surely, 2^30312240 is an apocalyptic number.

30312240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30312240 is an abundant number, since it is smaller than the sum of its proper divisors (77085648).

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

30312240 is a wasteful number, since it uses less digits than its factorization.

30312240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18066 (or 18060 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 30312240 is about 5505.6552743520. The cubic root of 30312240 is about 311.7975346523.

Adding to 30312240 its reverse (4221303), we get a palindrome (34533543).

The spelling of 30312240 in words is "thirty million, three hundred twelve thousand, two hundred forty".