31628438020 has 24 divisors (see below), whose sum is σ = 66597804504. Its totient is φ = 12617454336.

The previous prime is 31628438003. The next prime is 31628438021. The reversal of 31628438020 is 2083482613.

It can be written as a sum of positive squares in 4 ways, for example, as 14018086404 + 17610351616 = 118398^2 + 132704^2 .

It is not an unprimeable number, because it can be changed into a prime (31628438021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2112409 + ... + 2127328.

It is an arithmetic number, because the mean of its divisors is an integer number (2774908521).

Almost surely, 2^31628438020 is an apocalyptic number.

It is an amenable number.

31628438020 is an abundant number, since it is smaller than the sum of its proper divisors (34969366484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31628438020 is a wasteful number, since it uses less digits than its factorization.

31628438020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240119 (or 4240117 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 31628438020 in words is "thirty-one billion, six hundred twenty-eight million, four hundred thirty-eight thousand, twenty".