31428117504 has 176 divisors, whose sum is σ = 106371945600. Its totient is φ = 8979406848.

The previous prime is 31428117503. The next prime is 31428117551. The reversal of 31428117504 is 40571182413.

31428117504 is a `hidden beast` number, since 3 + 14 + 28 + 117 + 504 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (31428117503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112342 + ... + 274730.

Almost surely, 2^31428117504 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 31428117504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53185972800).

31428117504 is an abundant number, since it is smaller than the sum of its proper divisors (74943828096).

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

31428117504 is a wasteful number, since it uses less digits than its factorization.

31428117504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162425 (or 162401 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

Adding to 31428117504 its reverse (40571182413), we get a palindrome (71999299917).

The spelling of 31428117504 in words is "thirty-one billion, four hundred twenty-eight million, one hundred seventeen thousand, five hundred four".