1304206640 has 40 divisors (see below), whose sum is σ = 3307944528. Its totient is φ = 474256640.

The previous prime is 1304206633. The next prime is 1304206667. The reversal of 1304206640 is 466024031.

It is a tau number, because it is divible by the number of its divisors (40).

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, 740147 + ... + 741906.

Almost surely, 2^1304206640 is an apocalyptic number.

1304206640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304206640 is an abundant number, since it is smaller than the sum of its proper divisors (2003737888).

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

1304206640 is a wasteful number, since it uses less digits than its factorization.

1304206640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482077 (or 1482071 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1304206640 is about 36113.8012399692. The cubic root of 1304206640 is about 1092.5688199242.

The spelling of 1304206640 in words is "one billion, three hundred four million, two hundred six thousand, six hundred forty".