30928829 has 4 divisors (see below), whose sum is σ = 31089276. Its totient is φ = 30768384.

The previous prime is 30928823. The next prime is 30928837. The reversal of 30928829 is 92882903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92882903 = 331 ⋅280613.

It can be written as a sum of positive squares in 2 ways, for example, as 20025625 + 10903204 = 4475^2 + 3302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30928829 is a prime.

It is a super-2 number, since 2×30928829² = 1913184926622482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30928823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79934 + ... + 80319.

It is an arithmetic number, because the mean of its divisors is an integer number (7772319).

Almost surely, 2^30928829 is an apocalyptic number.

It is an amenable number.

30928829 is a deficient number, since it is larger than the sum of its proper divisors (160447).

30928829 is a wasteful number, since it uses less digits than its factorization.

30928829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160446.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 30928829 is about 5561.3693457637. The cubic root of 30928829 is about 313.8974775848.

The spelling of 30928829 in words is "thirty million, nine hundred twenty-eight thousand, eight hundred twenty-nine".