640000036427 has 4 divisors (see below), whose sum is σ = 640221722736. Its totient is φ = 639778350120.

The previous prime is 640000036373. The next prime is 640000036447. The reversal of 640000036427 is 724630000046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724630000046 = 2 ⋅362315000023.

It is a cyclic number.

It is not a de Polignac number, because 640000036427 - 2¹⁰ = 640000035403 is a prime.

It is a super-2 number, since 2×640000036427² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640000036393 and 640000036402.

It is not an unprimeable number, because it can be changed into a prime (640000036447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110838824 + ... + 110844597.

It is an arithmetic number, because the mean of its divisors is an integer number (160055430684).

Almost surely, 2^640000036427 is an apocalyptic number.

640000036427 is a deficient number, since it is larger than the sum of its proper divisors (221686309).

640000036427 is a wasteful number, since it uses less digits than its factorization.

640000036427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221686308.

The product of its (nonzero) digits is 24192, while the sum is 32.

The spelling of 640000036427 in words is "six hundred forty billion, thirty-six thousand, four hundred twenty-seven".