3634855820 has 24 divisors (see below), whose sum is σ = 7819374528. Its totient is φ = 1418480000.

The previous prime is 3634855787. The next prime is 3634855823. The reversal of 3634855820 is 285584363.

It is not an unprimeable number, because it can be changed into a prime (3634855823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2215556 + ... + 2217195.

It is an arithmetic number, because the mean of its divisors is an integer number (325807272).

Almost surely, 2^3634855820 is an apocalyptic number.

It is an amenable number.

3634855820 is an abundant number, since it is smaller than the sum of its proper divisors (4184518708).

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

3634855820 is a wasteful number, since it uses less digits than its factorization.

3634855820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432801 (or 4432799 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The square root of 3634855820 is about 60289.7654664538. The cubic root of 3634855820 is about 1537.5493462030.

The spelling of 3634855820 in words is "three billion, six hundred thirty-four million, eight hundred fifty-five thousand, eight hundred twenty".