731989440 has 896 divisors, whose sum is σ = 3413760000. Its totient is φ = 146313216.

The previous prime is 731989439. The next prime is 731989471. The reversal of 731989440 is 44989137.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 38525751 + ... + 38525769.

It is an arithmetic number, because the mean of its divisors is an integer number (3810000).

Almost surely, 2^731989440 is an apocalyptic number.

731989440 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 731989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1706880000).

731989440 is an abundant number, since it is smaller than the sum of its proper divisors (2681770560).

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

731989440 is a wasteful number, since it uses less digits than its factorization.

731989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 731989440 is about 27055.3033618180. The cubic root of 731989440 is about 901.2285444353.

The spelling of 731989440 in words is "seven hundred thirty-one million, nine hundred eighty-nine thousand, four hundred forty".