640086026 has 8 divisors (see below), whose sum is σ = 960249540. Its totient is φ = 320002848.

The previous prime is 640086001. The next prime is 640086049. The reversal of 640086026 is 620680046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 639837025 + 249001 = 25295^2 + 499^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640085983 and 640086001.

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, 7310 + ... + 36518.

Almost surely, 2^640086026 is an apocalyptic number.

640086026 is a deficient number, since it is larger than the sum of its proper divisors (320163514).

640086026 is a wasteful number, since it uses less digits than its factorization.

640086026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40168.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 640086026 is about 25299.9214623287. The cubic root of 640086026 is about 861.8124862409.

The spelling of 640086026 in words is "six hundred forty million, eighty-six thousand, twenty-six".