64804681040 has 40 divisors (see below), whose sum is σ = 164368238688. Its totient is φ = 23565338240.

The previous prime is 64804681013. The next prime is 64804681069. The reversal of 64804681040 is 4018640846.

64804681040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×64804681040² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36819962 + ... + 36821721.

Almost surely, 2^64804681040 is an apocalyptic number.

It is an amenable number.

64804681040 is an abundant number, since it is smaller than the sum of its proper divisors (99563557648).

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

64804681040 is a wasteful number, since it uses less digits than its factorization.

64804681040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73641707 (or 73641701 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 41.

The spelling of 64804681040 in words is "sixty-four billion, eight hundred four million, six hundred eighty-one thousand, forty".