31538180352 has 144 divisors (see below), whose sum is σ = 96631097472. Its totient is φ = 8944926720.

The previous prime is 31538180341. The next prime is 31538180357. The reversal of 31538180352 is 25308183513.

It is a self number, because there is not a number n which added to its sum of digits gives 31538180352.

It is not an unprimeable number, because it can be changed into a prime (31538180357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 715102 + ... + 757922.

It is an arithmetic number, because the mean of its divisors is an integer number (671049288).

Almost surely, 2^31538180352 is an apocalyptic number.

31538180352 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31538180352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48315548736).

31538180352 is an abundant number, since it is smaller than the sum of its proper divisors (65092917120).

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

31538180352 is a wasteful number, since it uses less digits than its factorization.

31538180352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42984 (or 42970 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 31538180352 in words is "thirty-one billion, five hundred thirty-eight million, one hundred eighty thousand, three hundred fifty-two".