640371122 has 16 divisors (see below), whose sum is σ = 984116952. Its totient is φ = 312399360.

The previous prime is 640371101. The next prime is 640371143. The reversal of 640371122 is 221173046.

It is an interprime number because it is at equal distance from previous prime (640371101) and next prime (640371143).

It can be written as a sum of positive squares in 4 ways, for example, as 494662081 + 145709041 = 22241^2 + 12071^2 .

It is a junction number, because it is equal to n+sod(n) for n = 640371091 and 640371100.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2498 + ... + 35874.

Almost surely, 2^640371122 is an apocalyptic number.

640371122 is a deficient number, since it is larger than the sum of its proper divisors (343745830).

640371122 is a wasteful number, since it uses less digits than its factorization.

640371122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33613.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 640371122 is about 25305.5551608733. Note that the first 3 decimals coincide. The cubic root of 640371122 is about 861.9404184319.

The spelling of 640371122 in words is "six hundred forty million, three hundred seventy-one thousand, one hundred twenty-two".