64946907840 has 56 divisors (see below), whose sum is σ = 206206435440. Its totient is φ = 17319175168.

The previous prime is 64946907769. The next prime is 64946907887. The reversal of 64946907840 is 4870964946.

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 7 ways as a sum of consecutive naturals, for example, 33825555 + ... + 33827474.

Almost surely, 2^64946907840 is an apocalyptic number.

64946907840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64946907840 is an abundant number, since it is smaller than the sum of its proper divisors (141259527600).

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

64946907840 is a wasteful number, since it uses less digits than its factorization.

64946907840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67653049 (or 67653039 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 64946907840 in words is "sixty-four billion, nine hundred forty-six million, nine hundred seven thousand, eight hundred forty".