64127577890 has 8 divisors (see below), whose sum is σ = 115429640220. Its totient is φ = 25651031152.

The previous prime is 64127577869. The next prime is 64127577907. The reversal of 64127577890 is 9877572146.

It can be written as a sum of positive squares in 2 ways, for example, as 59279101729 + 4848476161 = 243473^2 + 69631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64127577890² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3206378885 + ... + 3206378904.

Almost surely, 2^64127577890 is an apocalyptic number.

64127577890 is a deficient number, since it is larger than the sum of its proper divisors (51302062330).

64127577890 is a wasteful number, since it uses less digits than its factorization.

64127577890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412757796.

The product of its (nonzero) digits is 5927040, while the sum is 56.

The spelling of 64127577890 in words is "sixty-four billion, one hundred twenty-seven million, five hundred seventy-seven thousand, eight hundred ninety".