31240420200 has 768 divisors, whose sum is σ = 122406451200. Its totient is φ = 7348320000.

The previous prime is 31240420193. The next prime is 31240420231. The reversal of 31240420200 is 202404213.

31240420200 is a `hidden beast` number, since 3 + 1 + 2 + 40 + 420 + 200 = 666.

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 191 ways as a sum of consecutive naturals, for example, 206890125 + ... + 206890275.

It is an arithmetic number, because the mean of its divisors is an integer number (159383400).

Almost surely, 2^31240420200 is an apocalyptic number.

31240420200 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 31240420200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61203225600).

31240420200 is an abundant number, since it is smaller than the sum of its proper divisors (91166031000).

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

31240420200 is a wasteful number, since it uses less digits than its factorization.

31240420200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31240420200 its reverse (202404213), we get a palindrome (31442824413).

The spelling of 31240420200 in words is "thirty-one billion, two hundred forty million, four hundred twenty thousand, two hundred".