1299257728 has 64 divisors (see below), whose sum is σ = 2673277200. Its totient is φ = 628604928.

The previous prime is 1299257699. The next prime is 1299257731. The reversal of 1299257728 is 8277529921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 620908 + ... + 622996.

Almost surely, 2^1299257728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1299257728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1336638600).

1299257728 is an abundant number, since it is smaller than the sum of its proper divisors (1374019472).

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

1299257728 is a wasteful number, since it uses less digits than its factorization.

1299257728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259 (or 2247 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 52.

The square root of 1299257728 is about 36045.2178242829. The cubic root of 1299257728 is about 1091.1851229041.

The spelling of 1299257728 in words is "one billion, two hundred ninety-nine million, two hundred fifty-seven thousand, seven hundred twenty-eight".