31528740218 has 16 divisors (see below), whose sum is σ = 48576111360. Its totient is φ = 15336787536.

The previous prime is 31528740203. The next prime is 31528740227. The reversal of 31528740218 is 81204782513.

It is a super-2 number, since 2×31528740218² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1227455 + ... + 1252877.

It is an arithmetic number, because the mean of its divisors is an integer number (3036006960).

Almost surely, 2^31528740218 is an apocalyptic number.

31528740218 is a deficient number, since it is larger than the sum of its proper divisors (17047371142).

31528740218 is a wasteful number, since it uses less digits than its factorization.

31528740218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42221.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 31528740218 in words is "thirty-one billion, five hundred twenty-eight million, seven hundred forty thousand, two hundred eighteen".