31240080 has 120 divisors (see below), whose sum is σ = 108868032. Its totient is φ = 8325504.

The previous prime is 31240061. The next prime is 31240109. The reversal of 31240080 is 8004213.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18637 + ... + 20243.

Almost surely, 2^31240080 is an apocalyptic number.

31240080 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 31240080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54434016).

31240080 is an abundant number, since it is smaller than the sum of its proper divisors (77627952).

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

31240080 is a wasteful number, since it uses less digits than its factorization.

31240080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 31240080 is about 5589.2826015509. The cubic root of 31240080 is about 314.9469298349.

Adding to 31240080 its reverse (8004213), we get a palindrome (39244293).

The spelling of 31240080 in words is "thirty-one million, two hundred forty thousand, eighty".