31440060 has 144 divisors (see below), whose sum is σ = 104176800. Its totient is φ = 7644672.

The previous prime is 31440049. The next prime is 31440061. The reversal of 31440060 is 6004413.

It is a super-3 number, since 3×31440060³ (a number of 23 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99022 + ... + 99338.

It is an arithmetic number, because the mean of its divisors is an integer number (723450).

Almost surely, 2^31440060 is an apocalyptic number.

31440060 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 31440060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52088400).

31440060 is an abundant number, since it is smaller than the sum of its proper divisors (72736740).

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

31440060 is a wasteful number, since it uses less digits than its factorization.

31440060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31440060 is about 5607.1436578707. The cubic root of 31440060 is about 315.6175338560.

Adding to 31440060 its reverse (6004413), we get a palindrome (37444473).

The spelling of 31440060 in words is "thirty-one million, four hundred forty thousand, sixty".