731687040 has 512 divisors, whose sum is σ = 3102105600. Its totient is φ = 159363072.

The previous prime is 731687027. The next prime is 731687051. The reversal of 731687040 is 40786137.

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 = 731686986 and 731687004.

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, 2781949 + ... + 2782211.

It is an arithmetic number, because the mean of its divisors is an integer number (6058800).

Almost surely, 2^731687040 is an apocalyptic number.

731687040 is a gapful number since it is divisible by the number (70) 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 731687040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1551052800).

731687040 is an abundant number, since it is smaller than the sum of its proper divisors (2370418560).

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

731687040 is a wasteful number, since it uses less digits than its factorization.

731687040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 731687040 is about 27049.7142313925. The cubic root of 731687040 is about 901.1044219480.

It can be divided in two parts, 73168 and 7040, that added together give a palindrome (80208).

The spelling of 731687040 in words is "seven hundred thirty-one million, six hundred eighty-seven thousand, forty".