3640878 has 24 divisors (see below), whose sum is σ = 7986888. Its totient is φ = 1198512.

The previous prime is 3640867. The next prime is 3640891. The reversal of 3640878 is 8780463.

3640878 is a `hidden beast` number, since 3 + 640 + 8 + 7 + 8 = 666.

It is a super-2 number, since 2×3640878² = 26511985221768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 276 + ... + 2712.

It is an arithmetic number, because the mean of its divisors is an integer number (332787).

Almost surely, 2^3640878 is an apocalyptic number.

3640878 is an abundant number, since it is smaller than the sum of its proper divisors (4346010).

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

3640878 is a wasteful number, since it uses less digits than its factorization.

3640878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528 (or 2525 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 3640878 is about 1908.1084874818. The cubic root of 3640878 is about 153.8398008018.

The spelling of 3640878 in words is "three million, six hundred forty thousand, eight hundred seventy-eight".