649478578 has 16 divisors (see below), whose sum is σ = 1117730304. Its totient is φ = 277263360.

The previous prime is 649478563. The next prime is 649478611. The reversal of 649478578 is 875874946.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86658 + ... + 93853.

It is an arithmetic number, because the mean of its divisors is an integer number (69858144).

Almost surely, 2^649478578 is an apocalyptic number.

649478578 is a deficient number, since it is larger than the sum of its proper divisors (468251726).

649478578 is a wasteful number, since it uses less digits than its factorization.

649478578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180777.

The product of its digits is 13547520, while the sum is 58.

The square root of 649478578 is about 25484.8695896212. The cubic root of 649478578 is about 866.0074145937.

It can be divided in two parts, 649478 and 578, that added together give a palindrome (650056).

The spelling of 649478578 in words is "six hundred forty-nine million, four hundred seventy-eight thousand, five hundred seventy-eight".