31223986780 has 144 divisors (see below), whose sum is σ = 79125645312. Its totient is φ = 10308816000.

The previous prime is 31223986769. The next prime is 31223986823. The reversal of 31223986780 is 8768932213.

It is a super-2 number, since 2×31223986780² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6407745 + ... + 6412615.

It is an arithmetic number, because the mean of its divisors is an integer number (549483648).

Almost surely, 2^31223986780 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 31223986780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39562822656).

31223986780 is an abundant number, since it is smaller than the sum of its proper divisors (47901658532).

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

31223986780 is a wasteful number, since it uses less digits than its factorization.

31223986780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5136 (or 5127 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 31223986780 in words is "thirty-one billion, two hundred twenty-three million, nine hundred eighty-six thousand, seven hundred eighty".