31778385804 has 576 divisors, whose sum is σ = 104413639680. Its totient is φ = 8238827520.

The previous prime is 31778385797. The next prime is 31778385809. The reversal of 31778385804 is 40858387713.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31778385809) by changing a digit.

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 191 ways as a sum of consecutive naturals, for example, 739032207 + ... + 739032249.

It is an arithmetic number, because the mean of its divisors is an integer number (181273680).

Almost surely, 2^31778385804 is an apocalyptic number.

31778385804 is a gapful number since it is divisible by the number (34) 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 31778385804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52206819840).

31778385804 is an abundant number, since it is smaller than the sum of its proper divisors (72635253876).

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

31778385804 is a wasteful number, since it uses less digits than its factorization.

31778385804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 31778385804 in words is "thirty-one billion, seven hundred seventy-eight million, three hundred eighty-five thousand, eight hundred four".