30640534 has 4 divisors (see below), whose sum is σ = 45960804. Its totient is φ = 15320266.

The previous prime is 30640523. The next prime is 30640537. The reversal of 30640534 is 43504603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43504603 = 823 ⋅52861.

It is a junction number, because it is equal to n+sod(n) for n = 30640499 and 30640508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640537) 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 as a sum of consecutive naturals, namely, 7660132 + ... + 7660135.

It is an arithmetic number, because the mean of its divisors is an integer number (11490201).

Almost surely, 2^30640534 is an apocalyptic number.

30640534 is a deficient number, since it is larger than the sum of its proper divisors (15320270).

30640534 is a wasteful number, since it uses less digits than its factorization.

30640534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15320269.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 30640534 is about 5535.3892365397. The cubic root of 30640534 is about 312.9191269995.

The spelling of 30640534 in words is "thirty million, six hundred forty thousand, five hundred thirty-four".