1347664720 has 80 divisors (see below), whose sum is σ = 3218276160. Its totient is φ = 524547072.

The previous prime is 1347664709. The next prime is 1347664739. The reversal of 1347664720 is 274667431.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1193116 + ... + 1194244.

It is an arithmetic number, because the mean of its divisors is an integer number (40228452).

Almost surely, 2^1347664720 is an apocalyptic number.

1347664720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1347664720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1609138080).

1347664720 is an abundant number, since it is smaller than the sum of its proper divisors (1870611440).

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

1347664720 is a wasteful number, since it uses less digits than its factorization.

1347664720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 1347664720 is about 36710.5532510748. The cubic root of 1347664720 is about 1104.5718043633.

The spelling of 1347664720 in words is "one billion, three hundred forty-seven million, six hundred sixty-four thousand, seven hundred twenty".