31500480 has 224 divisors, whose sum is σ = 115580160. Its totient is φ = 7188480.

The previous prime is 31500463. The next prime is 31500487. The reversal of 31500480 is 8400513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31500487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200562 + ... + 200718.

Almost surely, 2^31500480 is an apocalyptic number.

31500480 is a gapful number since it is divisible by the number (30) 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 31500480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57790080).

31500480 is an abundant number, since it is smaller than the sum of its proper divisors (84079680).

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

31500480 is a wasteful number, since it uses less digits than its factorization.

31500480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 31500480 is about 5612.5288417967. The cubic root of 31500480 is about 315.8195840295.

Adding to 31500480 its reverse (8400513), we get a palindrome (39900993).

The spelling of 31500480 in words is "thirty-one million, five hundred thousand, four hundred eighty".