1346720640 has 64 divisors (see below), whose sum is σ = 4292678160. Its totient is φ = 359124992.

The previous prime is 1346720629. The next prime is 1346720651. The reversal of 1346720640 is 460276431.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1346720629) and next prime (1346720651).

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

It is a super-3 number, since 3×1346720640³ (a number of 28 digits) contains 333 as substring.

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, 348789 + ... + 352628.

Almost surely, 2^1346720640 is an apocalyptic number.

1346720640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1346720640 is an abundant number, since it is smaller than the sum of its proper divisors (2945957520).

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

1346720640 is an equidigital number, since it uses as much as digits as its factorization.

1346720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701439 (or 701427 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 1346720640 is about 36697.6925705146. The cubic root of 1346720640 is about 1104.3138154304.

The spelling of 1346720640 in words is "one billion, three hundred forty-six million, seven hundred twenty thousand, six hundred forty".