31364245440 has 672 divisors, whose sum is σ = 128101344000. Its totient is φ = 7198709760.

The previous prime is 31364245399. The next prime is 31364245447. The reversal of 31364245440 is 4454246313.

31364245440 is a `hidden beast` number, since 3 + 1 + 3 + 642 + 4 + 5 + 4 + 4 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 31364245395 and 31364245404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31364245447) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 19862571 + ... + 19864149.

It is an arithmetic number, because the mean of its divisors is an integer number (190627000).

Almost surely, 2^31364245440 is an apocalyptic number.

31364245440 is a gapful number since it is divisible by the number (30) 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 31364245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64050672000).

31364245440 is an abundant number, since it is smaller than the sum of its proper divisors (96737098560).

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

31364245440 is a wasteful number, since it uses less digits than its factorization.

31364245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1619 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 31364245440 in words is "thirty-one billion, three hundred sixty-four million, two hundred forty-five thousand, four hundred forty".