1670720724 has 18 divisors (see below), whose sum is σ = 4223210810. Its totient is φ = 556906896.

The previous prime is 1670720671. The next prime is 1670720729. The reversal of 1670720724 is 4270270761.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1335171600 + 335549124 = 36540^2 + 18318^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 46408909 = 1670720724 / (1 + 6 + 7 + 0 + 7 + 2 + 0 + 7 + 2 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670720729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23204419 + ... + 23204490.

Almost surely, 2^1670720724 is an apocalyptic number.

It is an amenable number.

1670720724 is an abundant number, since it is smaller than the sum of its proper divisors (2552490086).

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

1670720724 is a wasteful number, since it uses less digits than its factorization.

1670720724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46408919 (or 46408914 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 1670720724 is about 40874.4507486033. The cubic root of 1670720724 is about 1186.5916463887.

The spelling of 1670720724 in words is "one billion, six hundred seventy million, seven hundred twenty thousand, seven hundred twenty-four".