64493239940 has 24 divisors (see below), whose sum is σ = 135793170240. Its totient is φ = 25729226208.

The previous prime is 64493239939. The next prime is 64493239961. The reversal of 64493239940 is 4993239446.

It is a super-2 number, since 2×64493239940² (a number of 22 digits) contains 22 as substring.

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, 4246592 + ... + 4261751.

It is an arithmetic number, because the mean of its divisors is an integer number (5658048760).

Almost surely, 2^64493239940 is an apocalyptic number.

It is an amenable number.

64493239940 is an abundant number, since it is smaller than the sum of its proper divisors (71299930300).

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

64493239940 is a wasteful number, since it uses less digits than its factorization.

64493239940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508731 (or 8508729 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 53.

The spelling of 64493239940 in words is "sixty-four billion, four hundred ninety-three million, two hundred thirty-nine thousand, nine hundred forty".