64673749350 has 240 divisors, whose sum is σ = 207262255200. Its totient is φ = 14646251520.

The previous prime is 64673749291. The next prime is 64673749363. The reversal of 64673749350 is 5394737646.

It is a happy number.

64673749350 is a `hidden beast` number, since 64 + 67 + 37 + 493 + 5 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3079686 + ... + 3100614.

It is an arithmetic number, because the mean of its divisors is an integer number (863592730).

Almost surely, 2^64673749350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64673749350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103631127600).

64673749350 is an abundant number, since it is smaller than the sum of its proper divisors (142588505850).

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

64673749350 is a wasteful number, since it uses less digits than its factorization.

64673749350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21069 (or 21055 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 54.

The spelling of 64673749350 in words is "sixty-four billion, six hundred seventy-three million, seven hundred forty-nine thousand, three hundred fifty".