64465728009880 has 128 divisors (see below), whose sum is σ = 164588798724480. Its totient is φ = 22586844487680.

The previous prime is 64465728009833. The next prime is 64465728009941. The reversal of 64465728009880 is 8890082756446.

It is a super-2 number, since 2×64465728009880² (a number of 28 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 31 ways as a sum of consecutive naturals, for example, 55121991 + ... + 56279350.

It is an arithmetic number, because the mean of its divisors is an integer number (1285849990035).

Almost surely, 2^{64465728009880} is an apocalyptic number.

It is an amenable number.

64465728009880 is an abundant number, since it is smaller than the sum of its proper divisors (100123070714600).

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

64465728009880 is a wasteful number, since it uses less digits than its factorization.

64465728009880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111401429 (or 111401425 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 67.

The spelling of 64465728009880 in words is "sixty-four trillion, four hundred sixty-five billion, seven hundred twenty-eight million, nine thousand, eight hundred eighty".