30640293 has 24 divisors (see below), whose sum is σ = 47392800. Its totient is φ = 19017504.

The previous prime is 30640279. The next prime is 30640319. The reversal of 30640293 is 39204603.

It is not a de Polignac number, because 30640293 - 2⁵ = 30640261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30644293) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8571 + ... + 11607.

It is an arithmetic number, because the mean of its divisors is an integer number (1974700).

Almost surely, 2^30640293 is an apocalyptic number.

It is an amenable number.

30640293 is a deficient number, since it is larger than the sum of its proper divisors (16752507).

30640293 is a wasteful number, since it uses less digits than its factorization.

30640293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121 (or 3118 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 30640293 is about 5535.3674674768. The cubic root of 30640293 is about 312.9183065862.

Adding to 30640293 its reverse (39204603), we get a palindrome (69844896).

The spelling of 30640293 in words is "thirty million, six hundred forty thousand, two hundred ninety-three".