731381616 has 320 divisors, whose sum is σ = 2609832960. Its totient is φ = 191324160.

The previous prime is 731381603. The next prime is 731381647. The reversal of 731381616 is 616183137.

731381616 is a `hidden beast` number, since 7 + 3 + 1 + 38 + 1 + 616 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2107555 + ... + 2107901.

It is an arithmetic number, because the mean of its divisors is an integer number (8155728).

Almost surely, 2^731381616 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 731381616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1304916480).

731381616 is an abundant number, since it is smaller than the sum of its proper divisors (1878451344).

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

731381616 is a wasteful number, since it uses less digits than its factorization.

731381616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 417 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 731381616 is about 27044.0680371870. The cubic root of 731381616 is about 900.9790235171.

The spelling of 731381616 in words is "seven hundred thirty-one million, three hundred eighty-one thousand, six hundred sixteen".