1305216728 has 16 divisors (see below), whose sum is σ = 2448097080. Its totient is φ = 652390848.

The previous prime is 1305216727. The next prime is 1305216739. The reversal of 1305216728 is 8276125031.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305216727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101 + ... + 51092.

Almost surely, 2^1305216728 is an apocalyptic number.

It is an amenable number.

1305216728 is a deficient number, since it is larger than the sum of its proper divisors (1142880352).

1305216728 is a wasteful number, since it uses less digits than its factorization.

1305216728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54386 (or 54382 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1305216728 is about 36127.7833253024. The cubic root of 1305216728 is about 1092.8508063922.

The spelling of 1305216728 in words is "one billion, three hundred five million, two hundred sixteen thousand, seven hundred twenty-eight".