649519870 has 8 divisors (see below), whose sum is σ = 1169135784. Its totient is φ = 259807944.

The previous prime is 649519861. The next prime is 649519889. The reversal of 649519870 is 78915946.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32475984 + ... + 32476003.

It is an arithmetic number, because the mean of its divisors is an integer number (146141973).

Almost surely, 2^649519870 is an apocalyptic number.

649519870 is a deficient number, since it is larger than the sum of its proper divisors (519615914).

649519870 is a wasteful number, since it uses less digits than its factorization.

649519870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64951994.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 649519870 is about 25485.6797044929. The cubic root of 649519870 is about 866.0257669673.

The spelling of 649519870 in words is "six hundred forty-nine million, five hundred nineteen thousand, eight hundred seventy".