64892486249640 has 384 divisors, whose sum is σ = 247622779872000. Its totient is φ = 14427068350464.

The previous prime is 64892486249639. The next prime is 64892486249707. The reversal of 64892486249640 is 4694268429846.

64892486249640 is a `hidden beast` number, since 6 + 4 + 8 + 92 + 4 + 8 + 6 + 2 + 496 + 40 = 666.

It is a super-2 number, since 2×64892486249640² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 295367751 + ... + 295587369.

It is an arithmetic number, because the mean of its divisors is an integer number (644850989250).

Almost surely, 2^{64892486249640} is an apocalyptic number.

64892486249640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64892486249640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123811389936000).

64892486249640 is an abundant number, since it is smaller than the sum of its proper divisors (182730293622360).

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

64892486249640 is a wasteful number, since it uses less digits than its factorization.

64892486249640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222849 (or 222842 counting only the distinct ones).

The product of its (nonzero) digits is 1146617856, while the sum is 72.

The spelling of 64892486249640 in words is "sixty-four trillion, eight hundred ninety-two billion, four hundred eighty-six million, two hundred forty-nine thousand, six hundred forty".