64632328840 has 16 divisors (see below), whose sum is σ = 145422739980. Its totient is φ = 25852931520.

The previous prime is 64632328807. The next prime is 64632328841. The reversal of 64632328840 is 4882323646.

It can be written as a sum of positive squares in 2 ways, for example, as 63525169764 + 1107159076 = 252042^2 + 33274^2 .

It is not an unprimeable number, because it can be changed into a prime (64632328841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807904071 + ... + 807904150.

Almost surely, 2^64632328840 is an apocalyptic number.

It is an amenable number.

64632328840 is an abundant number, since it is smaller than the sum of its proper divisors (80790411140).

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

64632328840 is a wasteful number, since it uses less digits than its factorization.

64632328840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615808232 (or 1615808228 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 46.

The spelling of 64632328840 in words is "sixty-four billion, six hundred thirty-two million, three hundred twenty-eight thousand, eight hundred forty".