30878231 has 4 divisors (see below), whose sum is σ = 31067832. Its totient is φ = 30688632.

The previous prime is 30878227. The next prime is 30878269. The reversal of 30878231 is 13287803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13287803 = 59 ⋅225217.

It is a cyclic number.

It is not a de Polignac number, because 30878231 - 2² = 30878227 is a prime.

It is a super-2 number, since 2×30878231² = 1906930299378722, 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 (30878291) 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, 94556 + ... + 94881.

It is an arithmetic number, because the mean of its divisors is an integer number (7766958).

Almost surely, 2^30878231 is an apocalyptic number.

30878231 is a deficient number, since it is larger than the sum of its proper divisors (189601).

30878231 is a wasteful number, since it uses less digits than its factorization.

30878231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189600.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 30878231 is about 5556.8184242424. The cubic root of 30878231 is about 313.7262106903.

The spelling of 30878231 in words is "thirty million, eight hundred seventy-eight thousand, two hundred thirty-one".