64400629672 has 24 divisors (see below), whose sum is σ = 124922512350. Its totient is φ = 31088093120.

The previous prime is 64400629669. The next prime is 64400629679. The reversal of 64400629672 is 27692600446.

It can be written as a sum of positive squares in 3 ways, for example, as 55062499716 + 9338129956 = 234654^2 + 96634^2 .

It is a super-2 number, since 2×64400629672² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64400629679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3857022 + ... + 3873682.

Almost surely, 2^64400629672 is an apocalyptic number.

It is an amenable number.

64400629672 is a deficient number, since it is larger than the sum of its proper divisors (60521882678).

64400629672 is an frugal number, since it uses more digits than its factorization.

64400629672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33357 (or 16692 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 64400629672 in words is "sixty-four billion, four hundred million, six hundred twenty-nine thousand, six hundred seventy-two".