640577302 has 4 divisors (see below), whose sum is σ = 960865956. Its totient is φ = 320288650.

The previous prime is 640577299. The next prime is 640577303. The reversal of 640577302 is 203775046.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640577303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160144324 + ... + 160144327.

It is an arithmetic number, because the mean of its divisors is an integer number (240216489).

Almost surely, 2^640577302 is an apocalyptic number.

640577302 is a deficient number, since it is larger than the sum of its proper divisors (320288654).

640577302 is a wasteful number, since it uses less digits than its factorization.

640577302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320288653.

The product of its (nonzero) digits is 35280, while the sum is 34.

The square root of 640577302 is about 25309.6286420801. The cubic root of 640577302 is about 862.0329146943.

The spelling of 640577302 in words is "six hundred forty million, five hundred seventy-seven thousand, three hundred two".