1825660720 has 40 divisors (see below), whose sum is σ = 4571176176. Its totient is φ = 674089728.

The previous prime is 1825660709. The next prime is 1825660721. The reversal of 1825660720 is 270665281.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1825660720.

It is not an unprimeable number, because it can be changed into a prime (1825660721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876682 + ... + 878761.

Almost surely, 2^1825660720 is an apocalyptic number.

1825660720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1825660720 is an abundant number, since it is smaller than the sum of its proper divisors (2745515456).

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

1825660720 is a wasteful number, since it uses less digits than its factorization.

1825660720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1755469 (or 1755463 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1825660720 is about 42727.7511694683. The cubic root of 1825660720 is about 1222.1936524941.

The spelling of 1825660720 in words is "one billion, eight hundred twenty-five million, six hundred sixty thousand, seven hundred twenty".