64606083840 has 144 divisors (see below), whose sum is σ = 229261989600. Its totient is φ = 17228279808.

The previous prime is 64606083827. The next prime is 64606083847. The reversal of 64606083840 is 4838060646.

64606083840 is a `hidden beast` number, since 6 + 4 + 6 + 0 + 608 + 38 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×64606083840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (64606083847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900135 + ... + 969254.

It is an arithmetic number, because the mean of its divisors is an integer number (1592097150).

Almost surely, 2^64606083840 is an apocalyptic number.

64606083840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64606083840 is an abundant number, since it is smaller than the sum of its proper divisors (164655905760).

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

64606083840 is a wasteful number, since it uses less digits than its factorization.

64606083840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869419 (or 1869399 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 64606083840 in words is "sixty-four billion, six hundred six million, eighty-three thousand, eight hundred forty".