3640878620 has 24 divisors (see below), whose sum is σ = 7648983888. Its totient is φ = 1455753600.

The previous prime is 3640878617. The next prime is 3640878643. The reversal of 3640878620 is 268780463.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14315 + ... + 86525.

It is an arithmetic number, because the mean of its divisors is an integer number (318707662).

Almost surely, 2^3640878620 is an apocalyptic number.

It is an amenable number.

3640878620 is an abundant number, since it is smaller than the sum of its proper divisors (4008105268).

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

3640878620 is a wasteful number, since it uses less digits than its factorization.

3640878620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74741 (or 74739 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 3640878620 is about 60339.6935689932. The cubic root of 3640878620 is about 1538.3980953415.

The spelling of 3640878620 in words is "three billion, six hundred forty million, eight hundred seventy-eight thousand, six hundred twenty".