31030740 has 144 divisors (see below), whose sum is σ = 103194000. Its totient is φ = 7501824.

The previous prime is 31030717. The next prime is 31030759. The reversal of 31030740 is 4703013.

It can be written as a sum of positive squares in 8 ways, for example, as 11370384 + 19660356 = 3372^2 + 4434^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208186 + ... + 208334.

It is an arithmetic number, because the mean of its divisors is an integer number (716625).

Almost surely, 2^31030740 is an apocalyptic number.

31030740 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 31030740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51597000).

31030740 is an abundant number, since it is smaller than the sum of its proper divisors (72163260).

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

31030740 is a wasteful number, since it uses less digits than its factorization.

31030740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 31030740 is about 5570.5242123161. The cubic root of 31030740 is about 314.2418653898.

Adding to 31030740 its reverse (4703013), we get a palindrome (35733753).

The spelling of 31030740 in words is "thirty-one million, thirty thousand, seven hundred forty".