2164377508728 has 64 divisors (see below), whose sum is σ = 5461075620000. Its totient is φ = 714776113152.

The previous prime is 2164377508717. The next prime is 2164377508751. The reversal of 2164377508728 is 8278057734612.

It is a super-3 number, since 3×2164377508728³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35675476 + ... + 35736092.

Almost surely, 2^{2164377508728} is an apocalyptic number.

It is an amenable number.

2164377508728 is an abundant number, since it is smaller than the sum of its proper divisors (3296698111272).

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

2164377508728 is a wasteful number, since it uses less digits than its factorization.

2164377508728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74384 (or 74380 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 60.

The spelling of 2164377508728 in words is "two trillion, one hundred sixty-four billion, three hundred seventy-seven million, five hundred eight thousand, seven hundred twenty-eight".