649492578 has 24 divisors (see below), whose sum is σ = 1608267648. Its totient is φ = 185569272.

The previous prime is 649492567. The next prime is 649492579. The reversal of 649492578 is 875294946.

649492578 is a `hidden beast` number, since 64 + 9 + 4 + 9 + 2 + 578 = 666.

649492578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (649492579) 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, 2577226 + ... + 2577477.

It is an arithmetic number, because the mean of its divisors is an integer number (67011152).

Almost surely, 2^649492578 is an apocalyptic number.

649492578 is an abundant number, since it is smaller than the sum of its proper divisors (958775070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649492578 is a wasteful number, since it uses less digits than its factorization.

649492578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5154718 (or 5154715 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 649492578 is about 25485.1442609219. The cubic root of 649492578 is about 866.0136370298.

The spelling of 649492578 in words is "six hundred forty-nine million, four hundred ninety-two thousand, five hundred seventy-eight".