728447226 has 32 divisors (see below), whose sum is σ = 1583644608. Its totient is φ = 222040320.

The previous prime is 728447197. The next prime is 728447267. The reversal of 728447226 is 622744827.

It is a super-2 number, since 2×728447226² = 1061270722134190152, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35295 + ... + 51986.

It is an arithmetic number, because the mean of its divisors is an integer number (49488894).

Almost surely, 2^728447226 is an apocalyptic number.

728447226 is an abundant number, since it is smaller than the sum of its proper divisors (855197382).

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

728447226 is a wasteful number, since it uses less digits than its factorization.

728447226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87406.

The product of its digits is 301056, while the sum is 42.

The square root of 728447226 is about 26989.7615032071. The cubic root of 728447226 is about 899.7724634671.

The spelling of 728447226 in words is "seven hundred twenty-eight million, four hundred forty-seven thousand, two hundred twenty-six".