31503055440 has 80 divisors (see below), whose sum is σ = 98626473216. Its totient is φ = 8317632000.

The previous prime is 31503055349. The next prime is 31503055459. The reversal of 31503055440 is 4455030513.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 31503055398 and 31503055407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 625576 + ... + 674055.

Almost surely, 2^31503055440 is an apocalyptic number.

31503055440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31503055440 is an abundant number, since it is smaller than the sum of its proper divisors (67123417776).

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

31503055440 is a wasteful number, since it uses less digits than its factorization.

31503055440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299748 (or 1299742 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 31503055440 its reverse (4455030513), we get a palindrome (35958085953).

The spelling of 31503055440 in words is "thirty-one billion, five hundred three million, fifty-five thousand, four hundred forty".