3685280 has 48 divisors (see below), whose sum is σ = 8999424. Its totient is φ = 1424640.

The previous prime is 3685273. The next prime is 3685289. The reversal of 3685280 is 825863.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (3685289) 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, 4589 + ... + 5331.

It is an arithmetic number, because the mean of its divisors is an integer number (187488).

Almost surely, 2^3685280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3685280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4499712).

3685280 is an abundant number, since it is smaller than the sum of its proper divisors (5314144).

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

3685280 is a wasteful number, since it uses less digits than its factorization.

3685280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 3685280 is about 1919.7083111765. The cubic root of 3685280 is about 154.4626554483.

The spelling of 3685280 in words is "three million, six hundred eighty-five thousand, two hundred eighty".