31300320 has 96 divisors (see below), whose sum is σ = 100306080. Its totient is φ = 8202240.

The previous prime is 31300307. The next prime is 31300327. The reversal of 31300320 is 2300313.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 31300296 and 31300305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31300327) 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, 28746 + ... + 29814.

It is an arithmetic number, because the mean of its divisors is an integer number (1044855).

Almost surely, 2^31300320 is an apocalyptic number.

31300320 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 31300320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50153040).

31300320 is an abundant number, since it is smaller than the sum of its proper divisors (69005760).

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

31300320 is a wasteful number, since it uses less digits than its factorization.

31300320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 12.

The square root of 31300320 is about 5594.6688910069. The cubic root of 31300320 is about 315.1492364159.

Adding to 31300320 its reverse (2300313), we get a palindrome (33600633).

The spelling of 31300320 in words is "thirty-one million, three hundred thousand, three hundred twenty".