729521940 has 96 divisors (see below), whose sum is σ = 2341140480. Its totient is φ = 166271616.

The previous prime is 729521939. The next prime is 729521953. The reversal of 729521940 is 49125927.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156889 + ... + 161471.

It is an arithmetic number, because the mean of its divisors is an integer number (24386880).

Almost surely, 2^729521940 is an apocalyptic number.

729521940 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 729521940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1170570240).

729521940 is an abundant number, since it is smaller than the sum of its proper divisors (1611618540).

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

729521940 is a wasteful number, since it uses less digits than its factorization.

729521940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4981 (or 4979 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 729521940 is about 27009.6638261197. The cubic root of 729521940 is about 900.2147388830.

The spelling of 729521940 in words is "seven hundred twenty-nine million, five hundred twenty-one thousand, nine hundred forty".