30278987913 has 4 divisors (see below), whose sum is σ = 40371983888. Its totient is φ = 20185991940.

The previous prime is 30278987909. The next prime is 30278987923. The reversal of 30278987913 is 31978987203.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31978987203 = 3 ⋅10659662401.

It is not a de Polignac number, because 30278987913 - 2² = 30278987909 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30278987923) 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, 5046497983 + ... + 5046497988.

It is an arithmetic number, because the mean of its divisors is an integer number (10092995972).

Almost surely, 2^30278987913 is an apocalyptic number.

It is an amenable number.

30278987913 is a deficient number, since it is larger than the sum of its proper divisors (10092995975).

30278987913 is a wasteful number, since it uses less digits than its factorization.

30278987913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10092995974.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The spelling of 30278987913 in words is "thirty billion, two hundred seventy-eight million, nine hundred eighty-seven thousand, nine hundred thirteen".