64781233632 has 72 divisors (see below), whose sum is σ = 184247088480. Its totient is φ = 21590760960.

The previous prime is 64781233597. The next prime is 64781233681. The reversal of 64781233632 is 23633218746.

64781233632 is a `hidden beast` number, since 6 + 4 + 7 + 8 + 1 + 2 + 3 + 3 + 632 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×64781233632² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3293844 + ... + 3313452.

It is an arithmetic number, because the mean of its divisors is an integer number (2558987340).

Almost surely, 2^64781233632 is an apocalyptic number.

It is an amenable number.

64781233632 is an abundant number, since it is smaller than the sum of its proper divisors (119465854848).

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

64781233632 is a wasteful number, since it uses less digits than its factorization.

64781233632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31096 (or 31085 counting only the distinct ones).

The product of its digits is 870912, while the sum is 45.

The spelling of 64781233632 in words is "sixty-four billion, seven hundred eighty-one million, two hundred thirty-three thousand, six hundred thirty-two".