728804431 has 8 divisors (see below), whose sum is σ = 743423184. Its totient is φ = 714217920.

The previous prime is 728804371. The next prime is 728804471. The reversal of 728804431 is 134408827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 728804431 - 2⁷ = 728804303 is a prime.

It is a super-2 number, since 2×728804431² = 1062311797290467522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728804471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40491 + ... + 55651.

It is an arithmetic number, because the mean of its divisors is an integer number (92927898).

Almost surely, 2^728804431 is an apocalyptic number.

728804431 is a deficient number, since it is larger than the sum of its proper divisors (14618753).

728804431 is a wasteful number, since it uses less digits than its factorization.

728804431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16121.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 728804431 is about 26996.3781089242. The cubic root of 728804431 is about 899.9195117321.

The spelling of 728804431 in words is "seven hundred twenty-eight million, eight hundred four thousand, four hundred thirty-one".