64632273840 has 160 divisors (see below), whose sum is σ = 222761932800. Its totient is φ = 17224462080.

The previous prime is 64632273833. The next prime is 64632273841. The reversal of 64632273840 is 4837223646.

64632273840 is a `hidden beast` number, since 6 + 4 + 632 + 2 + 7 + 3 + 8 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64632273841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3790935 + ... + 3807945.

It is an arithmetic number, because the mean of its divisors is an integer number (1392262080).

Almost surely, 2^64632273840 is an apocalyptic number.

64632273840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64632273840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111380966400).

64632273840 is an abundant number, since it is smaller than the sum of its proper divisors (158129658960).

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

64632273840 is a wasteful number, since it uses less digits than its factorization.

64632273840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18792 (or 18780 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 45.

The spelling of 64632273840 in words is "sixty-four billion, six hundred thirty-two million, two hundred seventy-three thousand, eight hundred forty".