3665820280 has 32 divisors (see below), whose sum is σ = 8271493200. Its totient is φ = 1462168576.

The previous prime is 3665820253. The next prime is 3665820281. The reversal of 3665820280 is 820285663.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665820281) 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, 115690 + ... + 143929.

Almost surely, 2^3665820280 is an apocalyptic number.

It is an amenable number.

3665820280 is an abundant number, since it is smaller than the sum of its proper divisors (4605672920).

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

3665820280 is a wasteful number, since it uses less digits than its factorization.

3665820280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259983 (or 259979 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 3665820280 is about 60546.0178707072. The cubic root of 3665820280 is about 1541.9030109078.

The spelling of 3665820280 in words is "three billion, six hundred sixty-five million, eight hundred twenty thousand, two hundred eighty".