31204080 has 120 divisors (see below), whose sum is σ = 110357520. Its totient is φ = 7879680.

The previous prime is 31204067. The next prime is 31204091. The reversal of 31204080 is 8040213.

It is a happy number.

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

It is a super-3 number, since 3×31204080³ (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 an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12540 + ... + 14820.

It is an arithmetic number, because the mean of its divisors is an integer number (919646).

Almost surely, 2^31204080 is an apocalyptic number.

31204080 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 31204080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55178760).

31204080 is an abundant number, since it is smaller than the sum of its proper divisors (79153440).

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

31204080 is a wasteful number, since it uses less digits than its factorization.

31204080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319 (or 2310 counting only the distinct ones).

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

The square root of 31204080 is about 5586.0612241543. The cubic root of 31204080 is about 314.8259053105.

Adding to 31204080 its reverse (8040213), we get a palindrome (39244293).

The spelling of 31204080 in words is "thirty-one million, two hundred four thousand, eighty".