1636064540 has 48 divisors (see below), whose sum is σ = 3945352320. Its totient is φ = 563618880.

The previous prime is 1636064527. The next prime is 1636064593. The reversal of 1636064540 is 454606361.

It is a self number, because there is not a number n which added to its sum of digits gives 1636064540.

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 15 ways as a sum of consecutive naturals, for example, 191522 + ... + 199881.

It is an arithmetic number, because the mean of its divisors is an integer number (82194840).

Almost surely, 2^1636064540 is an apocalyptic number.

1636064540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1636064540 is an abundant number, since it is smaller than the sum of its proper divisors (2309287780).

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

1636064540 is a wasteful number, since it uses less digits than its factorization.

1636064540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391442 (or 391440 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1636064540 is about 40448.2946488477. The cubic root of 1636064540 is about 1178.3296629246.

The spelling of 1636064540 in words is "one billion, six hundred thirty-six million, sixty-four thousand, five hundred forty".