31473778512 has 240 divisors, whose sum is σ = 95041416960. Its totient is φ = 8968340480.

The previous prime is 31473778489. The next prime is 31473778513. The reversal of 31473778512 is 21587737413.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31473778513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28534153 + ... + 28535255.

It is an arithmetic number, because the mean of its divisors is an integer number (396005904).

Almost surely, 2^31473778512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31473778512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47520708480).

31473778512 is an abundant number, since it is smaller than the sum of its proper divisors (63567638448).

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

31473778512 is a wasteful number, since it uses less digits than its factorization.

31473778512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1136 counting only the distinct ones).

The product of its digits is 987840, while the sum is 48.

The spelling of 31473778512 in words is "thirty-one billion, four hundred seventy-three million, seven hundred seventy-eight thousand, five hundred twelve".