30640215 has 8 divisors (see below), whose sum is σ = 49024368. Its totient is φ = 16341440.

The previous prime is 30640177. The next prime is 30640219. The reversal of 30640215 is 51204603.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30640215 - 2⁶ = 30640151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30640191 and 30640200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1021326 + ... + 1021355.

It is an arithmetic number, because the mean of its divisors is an integer number (6128046).

Almost surely, 2^30640215 is an apocalyptic number.

30640215 is a deficient number, since it is larger than the sum of its proper divisors (18384153).

30640215 is a wasteful number, since it uses less digits than its factorization.

30640215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042689.

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

The square root of 30640215 is about 5535.3604218696. The cubic root of 30640215 is about 312.9180410573.

Adding to 30640215 its reverse (51204603), we get a palindrome (81844818).

The spelling of 30640215 in words is "thirty million, six hundred forty thousand, two hundred fifteen".