640283113 has 8 divisors (see below), whose sum is σ = 663625160. Its totient is φ = 617258880.

The previous prime is 640283107. The next prime is 640283117. The reversal of 640283113 is 311382046.

640283113 = 17892² + 17893².

It can be written as a sum of positive squares in 4 ways, for example, as 123721129 + 516561984 = 11123^2 + 22728^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 640283113 - 2⁵ = 640283081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640283117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75348 + ... + 83413.

It is an arithmetic number, because the mean of its divisors is an integer number (82953145).

Almost surely, 2^640283113 is an apocalyptic number.

640283113 is the 17893-rd centered square number.

It is an amenable number.

640283113 is a deficient number, since it is larger than the sum of its proper divisors (23342047).

640283113 is a wasteful number, since it uses less digits than its factorization.

640283113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158907.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 640283113 is about 25303.8161746405. The cubic root of 640283113 is about 861.9009298775.

The spelling of 640283113 in words is "six hundred forty million, two hundred eighty-three thousand, one hundred thirteen".