31403778068 has 36 divisors (see below), whose sum is σ = 59817816828. Its totient is φ = 14418892800.

The previous prime is 31403778067. The next prime is 31403778089. The reversal of 31403778068 is 86087730413.

It can be written as a sum of positive squares in 6 ways, for example, as 2477251984 + 28926526084 = 49772^2 + 170078^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31403778067) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10118 + ... + 250818.

It is an arithmetic number, because the mean of its divisors is an integer number (1661606023).

Almost surely, 2^31403778068 is an apocalyptic number.

It is an amenable number.

31403778068 is a deficient number, since it is larger than the sum of its proper divisors (28414038760).

31403778068 is a wasteful number, since it uses less digits than its factorization.

31403778068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240924 (or 240909 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 31403778068 in words is "thirty-one billion, four hundred three million, seven hundred seventy-eight thousand, sixty-eight".