726398320 has 20 divisors (see below), whose sum is σ = 1688876280. Its totient is φ = 290559296.

The previous prime is 726398279. The next prime is 726398339. The reversal of 726398320 is 23893627.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4539910 + ... + 4540069.

It is an arithmetic number, because the mean of its divisors is an integer number (84443814).

Almost surely, 2^726398320 is an apocalyptic number.

It is an amenable number.

726398320 is an abundant number, since it is smaller than the sum of its proper divisors (962477960).

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

726398320 is a wasteful number, since it uses less digits than its factorization.

726398320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9079992 (or 9079986 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 726398320 is about 26951.7776779195. Note that the first 3 decimals coincide. The cubic root of 726398320 is about 898.9280736053.

The spelling of 726398320 in words is "seven hundred twenty-six million, three hundred ninety-eight thousand, three hundred twenty".