640377333 has 40 divisors (see below), whose sum is σ = 995781600. Its totient is φ = 409624992.

The previous prime is 640377299. The next prime is 640377341. The reversal of 640377333 is 333773046.

640377333 is a `hidden beast` number, since 640 + 3 + 7 + 7 + 3 + 3 + 3 = 666.

It is not a de Polignac number, because 640377333 - 2⁸ = 640377077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640377343) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 419710 + ... + 421232.

It is an arithmetic number, because the mean of its divisors is an integer number (24894540).

Almost surely, 2^640377333 is an apocalyptic number.

It is an amenable number.

640377333 is a deficient number, since it is larger than the sum of its proper divisors (355404267).

640377333 is a wasteful number, since it uses less digits than its factorization.

640377333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743 (or 1734 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 36.

The square root of 640377333 is about 25305.6778806654. The cubic root of 640377333 is about 861.9432050945.

The spelling of 640377333 in words is "six hundred forty million, three hundred seventy-seven thousand, three hundred thirty-three".