31475442240 has 448 divisors, whose sum is σ = 122965585920. Its totient is φ = 7515002880.

The previous prime is 31475442227. The next prime is 31475442241. The reversal of 31475442240 is 4224457413.

31475442240 is a `hidden beast` number, since 3 + 147 + 54 + 422 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 31475442195 and 31475442204.

It is not an unprimeable number, because it can be changed into a prime (31475442241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6365209 + ... + 6370151.

Almost surely, 2^31475442240 is an apocalyptic number.

31475442240 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 31475442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61482792960).

31475442240 is an abundant number, since it is smaller than the sum of its proper divisors (91490143680).

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

31475442240 is a wasteful number, since it uses less digits than its factorization.

31475442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5047 (or 5031 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

Adding to 31475442240 its reverse (4224457413), we get a palindrome (35699899653).

The spelling of 31475442240 in words is "thirty-one billion, four hundred seventy-five million, four hundred forty-two thousand, two hundred forty".