1304273664 has 180 divisors, whose sum is σ = 4016541760. Its totient is φ = 420526080.

The previous prime is 1304273651. The next prime is 1304273671. The reversal of 1304273664 is 4663724031.

It is a happy number.

It is a super-2 number, since 2×1304273664² = 3402259581207969792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 641802 + ... + 643830.

Almost surely, 2^1304273664 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 1304273664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008270880).

1304273664 is an abundant number, since it is smaller than the sum of its proper divisors (2712268096).

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

1304273664 is an equidigital number, since it uses as much as digits as its factorization.

1304273664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088 (or 2065 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 1304273664 is about 36114.7291835340. The cubic root of 1304273664 is about 1092.5875355366.

Adding to 1304273664 its reverse (4663724031), we get a palindrome (5967997695).

The spelling of 1304273664 in words is "one billion, three hundred four million, two hundred seventy-three thousand, six hundred sixty-four".