31628438019 has 6 divisors (see below), whose sum is σ = 45685521596. Its totient is φ = 21085625340.

The previous prime is 31628438003. The next prime is 31628438021. The reversal of 31628438019 is 91083482613.

31628438019 is a `hidden beast` number, since 3 + 1 + 628 + 4 + 3 + 8 + 0 + 19 = 666.

It is not a de Polignac number, because 31628438019 - 2⁴ = 31628438003 is a prime.

It is a super-2 number, since 2×31628438019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31628438719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1757135437 + ... + 1757135454.

Almost surely, 2^31628438019 is an apocalyptic number.

31628438019 is a deficient number, since it is larger than the sum of its proper divisors (14057083577).

31628438019 is a wasteful number, since it uses less digits than its factorization.

31628438019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514270897 (or 3514270894 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 31628438019 in words is "thirty-one billion, six hundred twenty-eight million, four hundred thirty-eight thousand, nineteen".