640525082 has 8 divisors (see below), whose sum is σ = 1017304596. Its totient is φ = 301423552.

The previous prime is 640525073. The next prime is 640525121. The reversal of 640525082 is 280525046.

It can be written as a sum of positive squares in 2 ways, for example, as 638623441 + 1901641 = 25271^2 + 1379^2 .

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

It is a super-2 number, since 2×640525082² = 820544761342213448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9419453 + ... + 9419520.

Almost surely, 2^640525082 is an apocalyptic number.

640525082 is a deficient number, since it is larger than the sum of its proper divisors (376779514).

640525082 is a wasteful number, since it uses less digits than its factorization.

640525082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18838992.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 640525082 is about 25308.5969978583. The cubic root of 640525082 is about 862.0094896880.

The spelling of 640525082 in words is "six hundred forty million, five hundred twenty-five thousand, eighty-two".