728345290 has 16 divisors (see below), whose sum is σ = 1312449480. Its totient is φ = 291020800.

The previous prime is 728345287. The next prime is 728345357. The reversal of 728345290 is 92543827.

It can be written as a sum of positive squares in 4 ways, for example, as 619163689 + 109181601 = 24883^2 + 10449^2 .

It is a super-2 number, since 2×728345290² = 1060973722930368200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29911 + ... + 48490.

Almost surely, 2^728345290 is an apocalyptic number.

728345290 is a deficient number, since it is larger than the sum of its proper divisors (584104190).

728345290 is a wasteful number, since it uses less digits than its factorization.

728345290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79337.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 728345290 is about 26987.8730173387. The cubic root of 728345290 is about 899.7304913190.

The spelling of 728345290 in words is "seven hundred twenty-eight million, three hundred forty-five thousand, two hundred ninety".