30302640 has 80 divisors (see below), whose sum is σ = 104383200. Its totient is φ = 8080128.

The previous prime is 30302627. The next prime is 30302641. The reversal of 30302640 is 4620303.

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

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (30302641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4855 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (1304790).

Almost surely, 2^30302640 is an apocalyptic number.

30302640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30302640 is an abundant number, since it is smaller than the sum of its proper divisors (74080560).

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

30302640 is a wasteful number, since it uses less digits than its factorization.

30302640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14051 (or 14039 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 30302640 is about 5504.7833744844. The cubic root of 30302640 is about 311.7646153610.

Adding to 30302640 its reverse (4620303), we get a palindrome (34922943).

The spelling of 30302640 in words is "thirty million, three hundred two thousand, six hundred forty".