641662407 has 12 divisors (see below), whose sum is σ = 927464200. Its totient is φ = 427489488.

The previous prime is 641662387. The next prime is 641662421. The reversal of 641662407 is 704266146.

641662407 is a `hidden beast` number, since 641 + 6 + 6 + 2 + 4 + 0 + 7 = 666.

It is not a de Polignac number, because 641662407 - 2⁷ = 641662279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641662457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9073 + ... + 36954.

Almost surely, 2^641662407 is an apocalyptic number.

641662407 is a deficient number, since it is larger than the sum of its proper divisors (285801793).

641662407 is a wasteful number, since it uses less digits than its factorization.

641662407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47582 (or 47579 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 641662407 is about 25331.0561761645. The cubic root of 641662407 is about 862.5193865838.

The spelling of 641662407 in words is "six hundred forty-one million, six hundred sixty-two thousand, four hundred seven".