30640260 has 48 divisors (see below), whose sum is σ = 98050176. Its totient is φ = 7003392.

The previous prime is 30640249. The next prime is 30640261. The reversal of 30640260 is 6204603.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (30640261) 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, 36057 + ... + 36896.

It is an arithmetic number, because the mean of its divisors is an integer number (2042712).

Almost surely, 2^30640260 is an apocalyptic number.

30640260 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30640260 is an abundant number, since it is smaller than the sum of its proper divisors (67409916).

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

30640260 is a wasteful number, since it uses less digits than its factorization.

30640260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72972 (or 72970 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 30640260 is about 5535.3644866440. The cubic root of 30640260 is about 312.9181942471.

Adding to 30640260 its reverse (6204603), we get a palindrome (36844863).

The spelling of 30640260 in words is "thirty million, six hundred forty thousand, two hundred sixty".