649949578 has 8 divisors (see below), whose sum is σ = 979219872. Its totient is φ = 323542956.

The previous prime is 649949563. The next prime is 649949603. The reversal of 649949578 is 875949946.

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

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, 715350 + ... + 716257.

It is an arithmetic number, because the mean of its divisors is an integer number (122402484).

Almost surely, 2^649949578 is an apocalyptic number.

649949578 is a deficient number, since it is larger than the sum of its proper divisors (329270294).

649949578 is a wasteful number, since it uses less digits than its factorization.

649949578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431836.

The product of its digits is 19595520, while the sum is 61.

The square root of 649949578 is about 25494.1086920096. The cubic root of 649949578 is about 866.2167060396.

The spelling of 649949578 in words is "six hundred forty-nine million, nine hundred forty-nine thousand, five hundred seventy-eight".