1670440720 has 80 divisors (see below), whose sum is σ = 4189231872. Its totient is φ = 615790080.

The previous prime is 1670440703. The next prime is 1670440721. The reversal of 1670440720 is 270440761.

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

It is not an unprimeable number, because it can be changed into a prime (1670440721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1104765 + ... + 1106275.

Almost surely, 2^1670440720 is an apocalyptic number.

1670440720 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 1670440720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2094615936).

1670440720 is an abundant number, since it is smaller than the sum of its proper divisors (2518791152).

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

1670440720 is a wasteful number, since it uses less digits than its factorization.

1670440720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600 (or 2594 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 1670440720 is about 40871.0254336737. The cubic root of 1670440720 is about 1186.5253538469.

The spelling of 1670440720 in words is "one billion, six hundred seventy million, four hundred forty thousand, seven hundred twenty".