649840599 has 6 divisors (see below), whose sum is σ = 938658656. Its totient is φ = 433227060.

The previous prime is 649840591. The next prime is 649840621. The reversal of 649840599 is 995048946.

649840599 is a `hidden beast` number, since 6 + 4 + 9 + 8 + 40 + 599 = 666.

It is not a de Polignac number, because 649840599 - 2³ = 649840591 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 (649840591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36102247 + ... + 36102264.

Almost surely, 2^649840599 is an apocalyptic number.

649840599 is a deficient number, since it is larger than the sum of its proper divisors (288818057).

649840599 is a wasteful number, since it uses less digits than its factorization.

649840599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72204517 (or 72204514 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 649840599 is about 25491.9712654789. The cubic root of 649840599 is about 866.1682896135.

The spelling of 649840599 in words is "six hundred forty-nine million, eight hundred forty thousand, five hundred ninety-nine".