640976250350 has 24 divisors (see below), whose sum is σ = 1198267701048. Its totient is φ = 255089021600.

The previous prime is 640976250301. The next prime is 640976250379. The reversal of 640976250350 is 53052679046.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640976250295 and 640976250304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32527016 + ... + 32546715.

It is an arithmetic number, because the mean of its divisors is an integer number (49927820877).

Almost surely, 2^640976250350 is an apocalyptic number.

640976250350 is a deficient number, since it is larger than the sum of its proper divisors (557291450698).

640976250350 is a wasteful number, since it uses less digits than its factorization.

640976250350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65073940 (or 65073935 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 47.

The spelling of 640976250350 in words is "six hundred forty billion, nine hundred seventy-six million, two hundred fifty thousand, three hundred fifty".